Monday, October 18, 2010
Test Your DVD
Thursday, October 7, 2010
INPUT DEVICE
Any hardware device that sends data to the computer, without any input devices, a computer would only be a display device and not allow users to interact with it, much like a TV. To the right is a Logitech trackball mouse, an example of an input device. Below is a full listing of all the different types of computer input devices found on a computer.
How to Fix USB Device not Recognize in Windows
Are you getting a “USB device not recognized” error whenever you plug in a USB mouse, keyboard, or other USB device? I love USB and have 5 ports on my computer so that I can connect my mouse, keyboard, camera, phone, and printer to it all at once!
However, last weekend, my computer stopped recognizing my USB devices! The strange thing about it was that the USB ports were not bad because all of my devices were still getting power to them. I could still charge my cell phone without a problem!
So I started with the normal fixing methods, including uninstalling the drivers for my devices and reinstalling them. That didn’t work! Next I tried System Restore thinking that maybe I had installed something and it caused a conflict with the USB system drivers. That didn’t work!
I read online that in order to fix this problem I should go to Device Manager and uninstall all of the devices under USB Controllers. Restarted the computer, reinstalled the USB drivers, but the problem STILL did not go away!
You may also see in Device Manager that the device shows up as an “Unknown Device”.
So how did I finally fix the problem? Well, apparently it’s a super simple solution! No need to edit the registry, uninstall drivers, or anything of that sort.
Simply UNPLUG YOUR COMPUTER FROM THE POWER SUPPLY. Yes that’s it! Note that this does not mean just turning off your computer because modern computers don’t really turn off when you press the power button as the motherboard still gets power.
First to explain, the motherboard is where all of hardware of the computer is connected to, including the USB ports. Sometimes the motherboard needs to be “rebooted” also because something can go wrong, i.e. all your USB ports suddenly stop working. The small microprocessor on the motherboard will reload the drivers and your USB ports should be back to recognizing all devices!
So first turn off your computer using Shut Down or pressing the power button and then UNPLUG it from the wall outlet. Let it sit for about a minute and then plug it back in.
Hope this helps someone fix that pesky “USB device not recognized” Windows error!
How RAM Works
RAM is the best known form of computer memory and easy to upgrade. See more computer hardware pictures.
Random access memory (RAM) is the best known form of computer memory. RAM is considered "random access" because you can access any memory cell directly if you know the row and column that intersect at that cell.
The opposite of RAM is serial access memory (SAM). SAM stores data as a series of memory cells that can only be accessed sequentially (like a cassette tape). If the data is not in the current location, each memory cell is checked until the needed data is found. SAM works very well for memory buffers, where the data is normally stored in the order in which it will be used (a good example is the texture buffer memory on a video card). RAM data, on the other hand, can be accessed in any order.
Similar to a microprocessor, a memory chip is an integrated circuit(IC) made of millions of transistors and capacitors. In the most common form of computer memory, dynamic random access memory (DRAM), a transistor and a capacitor are paired to create amemory cell, which represents a single bit of data. The capacitor holds the bit of information -- a 0 or a 1 (see How Bits and Bytes Work for information on bits). The transistor acts as a switch that lets the control circuitry on the memory chip read the capacitor or change its state.
More on RAM |
A capacitor is like a small bucket that is able to store electrons. To store a 1 in the memory cell, the bucket is filled with electrons. To store a 0, it is emptied. The problem with the capacitor's bucket is that it has a leak. In a matter of a few milliseconds a full bucket becomes empty. Therefore, for dynamic memory to work, either the CPU or the memory controller has to come along and recharge all of the capacitors holding a 1 before they discharge. To do this, the mem ory controller reads the memory and then writes it right back. This refresh operation happens automatically thousands of times per second.
This refresh operation is where dynamic RAM gets its name. Dynamic RAM has to be dynamically refreshed all of the time or it forgets what it is holding. The downside of all of this refreshing is that it takes time and slows down the memory.
In this article, you'll learn all about what RAM is, what kind you should buy and how to install it. See the next page to learn more about dynamic RAM and memory cells.
Wednesday, October 6, 2010
Task Manager dissable program in Windows XP
Problem: It is due to some kind of virus/ trojan activity which normally disables the task manager.Now due to this problem when ever the user press alt+ctrl+del to launch windows task manager it gives an error saying “Task Manager is being disabled by your administrator”.
Solution:
To Enable the Disabled Task Manager on your system
1. Press window key+r to show run prompt
2. Follow the following steps
- Enter gpedit.msc in the run prompt and click OK
- In the Group Policy settings window
- Select User Configuration
- Select Administrative Templates
- Select System
- Select Ctrl+Alt+Delete options
- Select Remove Task Manager
- Double-click the Remove Task Manager option’.
- Set the property of this item as disabled.
Error Message: Task Manager has been dissabled
Method 1
Click Start, Run and type this command exactly as given below: (better - Copy and paste)
Method 2
Download and run this REG fix and double-click it.
Method 3
- Click Start, Run and type Regedit.exe
- Navigate to the following branch:
HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System
- In the right-pane, delete the value named DisableTaskMgr
- Close Regedit.exe
Method 4: Using Group Policy Editor - for Windows XP Professional
- Click Start, Run, type gpedit.msc and click OK.
- Navigate to this branch:
User Configuration / Administrative Templates / System / Ctrl+Alt+Delete Options / Remove Task Manager
- Double-click the Remove Task Manager option.
- Set the policy to Not Configured.
Startup Applications List
If you're frustrated with the time it takes your Windows PC to boot and then it seems to be running slowly you may have too many programs running at start-up - and have come to the right place to identify them. This is the original startup programs (as opposed to processes/tasks) list - one of the most comprehensive and most accurate!
"Name or Startup Item" in the table below refers to how an entry is displayed in MSConfig, Windows Defender or the registry "Run" keys. "Command or Data" refers to the program the entry runs. For further information on this and how to identify and disable startup programs please visit the Startup Content page.
For further information on random startup entries please visit the Startup Info page. For the next few months and foreseeable future I'll be verifying many of the Y, U, N & ? entries via virtual machines. If you can verify/identify those entries with a "?" status (especially hardware specific - such as laptops and motherboards) then please E-mail me (address at bottom of the page) or use the new Message Board. The updates on this page are kindly supported by this website hosting guide.
"Status" key:
- "Y" - Normally leave to run at start-up
- "N" - Not required or not recommended - typically infrequently used tasks that can be started manually if necessary
- "U" - User's choice - depends whether a user deems it necessary
- "X" - Definitely not required - typically viruses, spyware, adware and "resource hogs"
- "?" - Unknown
Variables:
- %System% - refers to the System folder; by default this is C:\Windows\System (9x/Me), C:\Winnt\System32 (NT/2K), or C:\Windows\System32 (XP/Vista)
- %Windir% - refers to the Windows installation folder; by default this is C:\Windows (9x/Me/XP/Vista) or C:\Winnt (NT/2K)
- %UserProfile% - refers to the current user's profile folder; by default this is C:\Documents and Settings\
(NT/2K/XP) or C:\Users\ (Vista) - %ProgramFiles% - refers to the Program Files folder; typically the path is C:\Program Files
How to Remove Startup Application
This is NOT a list of tasks/processes taken from Task Manager or the Close Program window (CTRL+ALT+DEL) but a list of startup applications, although you will find some of them listed via this method. Pressing CTRL+ALT+DEL identifies programs that are currently running - not necessarily at startup.
WHAT IS THE PROBLEM?
Startup Programs Database
- Y - This status flag means that this entry should be left alone and be allowed to run as if it is unchecked it may break the functionality or use of a particular program.
- N - This status flag means it is unnecessary to run this program automatically when Windows starts as you can run it manually when necessary.
- U - This status flag means it is up to you whether or not you feel this program needs to run automatically.
- X - This status flags means the item should definitely not start up automatically. Items that have this flag are generally malware such as viruses, trojans, hijackers, spyware, etc.
- ? - This status flag means the status of this entry is unknown at this time and more research is necessary.
Configure Auto-Starting Aplications
How can I easily control what applications will run when my computer starts?
After installing Windows 7, it's important to install the correct hardware drivers to get your video, sound, network, and other components working properly.
Automate the update process with Driver Genius Professional.
If you want to edit the startup locations manually, just look at the following REGISTRY keys:
HKU\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run HKU\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\RunOnce HKLM\Software\Microsoft\Windows\CurrentVersion\Run HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnceEx HKCU\Software\Microsoft\Windows\CurrentVersion\Run HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce
You should also look in the startup folders for all users and the current version.
If you're using Windows 9X or ME, you have the MSCONFIG utility to control what loads in your Startup Group, as well as from various places in the Registry.
Windows XP brings back MSCONFIG as a native tool and that version of MSCONFIG will work great in Windows 2000. You can download the XP version of MSCONFIG from HERE (64kb).
To make your life easier, take a look at 3 cool freeware applications that can easily help you do what you want.
AutoRuns
From Sysinternals. This applet shows you what programs are configured to run during system bootup or login. These programs include ones in your startup folder, Run, RunOnce, and other Registry keys. You'll probably be surprised at how many executables are launched automatically.
Open Device Manager
You can open Device Manager in any of the following ways:
Using the Windows interface
The following procedure allows you to open Device Manager through the Windows user interface.
To open Device Manager by using the Windows interfaceClick Start, and then click Control Panel.
Click Hardware and Sound.
Click Device Manager. One of the following occurs:
- If you are logged on as the built-in Administrator account, Device Manager opens.
- If you are logged on as a user that is a member of the Administrators group, then the User Account Control dialog box appears, and you must clickContinue to open Device Manager.
- If you are logged on as a standard user, a message appears indicating that you cannot make any changes to the devices. Click OK to open Device Manager in read-only mode.
- If you are logged on as the built-in Administrator account, Device Manager opens.
Using a command line
The following procedure allows you to open Device Manager from any command prompt.
To open Device Manager by using the command lineAt a command prompt, in the Start Search box, or in the Run box, type the following command:
mmc devmgmt.msc
One of the following occurs:
- If you are logged on as the built-in Administrator account, Device Manager opens.
- If you are logged on as a user that is a member of the Administrators group, then the User Account Control dialog box appears, and you must clickContinue to open Device Manager.
- If you are logged on as a standard user, a message appears indicating that you cannot make any changes to the devices. Click OK to open Device Manager in read-only mode.
- If you are logged on as the built-in Administrator account, Device Manager opens.
Using Computer Management
The following procedures allow you to open Computer Management, which includes Device Manager as one of its components.
| This procedure works only on Windows Vista. On Windows Server 2008, these steps start the Server Manager program. To start Computer Manager on Windows Server 2008, use the steps in the next procedure by using the command prompt. |
Click Start, then right-click Computer, and then click Manage.
One of the following occurs:
- If you are logged on as the built-in Administrator account, Computer Management opens.
- If you are logged on as a user that is a member of the Administrators group, then the User Account Control dialog box appears, and you must clickContinue to open Computer Management.
- If you are logged on as a standard user, Computer Management opens.
- If you are logged on as the built-in Administrator account, Computer Management opens.
Click Device Manager in the navigation pane.
One of the following occurs:
- If you are an administrator, Device Manager appears in the details pane.
- If you are a standard user, a message appears indicating that you cannot make any changes to the devices. Click OK to open Device Manager in read-only mode in the details pane.
- If you are an administrator, Device Manager appears in the details pane.
At a command prompt, in the Start Search box, or the Run box, type the command:
mmc compmgmt.msc
One of the following occurs:
- If you are logged on as the built-in Administrator account, Computer Management opens.
- If you are logged on as a user that is a member of the Administrators group, then the User Account Control dialog box appears, and you must clickContinue to open Computer Management.
- If you are logged on as a standard user, Computer Management opens.
- If you are logged on as the built-in Administrator account, Computer Management opens.
Click Device Manager in the navigation pane.
One of the following occurs:
- If you are an administrator, Device Manager appears in the details pane.
- If you are a standard user, a message appears indicating that you cannot make any changes to the devices. Click OK to open Device Manager in read-only mode in the details pane.
- If you are an administrator, Device Manager appears in the details pane.
From a remote computer
Open Computer Management using either of the procedures in the previous section.
On the Action menu, click Connect to another computer.
In the Select Computer dialog box, do one of the following:
- In the Another computer text box, type the name of the computer to access, and then click OK.
- Click Browse, and then click Advanced to find the computer you want. Click OK when you have selected the correct computer.
If the connection is successful, the name of the computer appears in parentheses next to the Computer Management label in the upper left.
Note
Access to Device Manager on a remote computer in this manner is "read-only." You cannot make any changes to devices or their settings. - In the Another computer text box, type the name of the computer to access, and then click OK.
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