Hi,
Thank you for your post!
Before going further, I would appreciate if you can clarify the following question:
1. When did this issue begin to occur? If recently, system restore can be under consideration.
2. Can you associate with any software\hardware change?
3. Have you installed any hotkey program? If so, please uninstall them.
At this point, I suggest using another keyboard as a test to make sure it is not a physical hardware issue.
Please make sure you have obtained the latest windows update and go to your computer manufacture’s download center to download the latest driver for your devices especially
any keyboard or display card related driver.
To troubleshoot the issue,
certain things you can try:
1.
Have a look whether you can reproduce the problem in safe mode.
Start your computer in safe mode
http://windows.microsoft.com/en-US/windows-vista/Start-your-computer-in-safe-mode
If behavior doesn’t persist in safe mode, it indicates that a third party program or service is preventing you from performing the action as supposed
to.
To validate or determine which service/startup item could be causing this, restart the computer and boot to desktop normally. Once done, perform clean
boot.
2.
Clean Boot prevents software conflicts by preventing the startup items and non Microsoft services from loading. This way you can safely follow the process of elimination to check which application is causing this behavior.
Refer:
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.microsoft.com/kb/929135
Note: Ensure that you put your computer back to normal startup mode after completing the troubleshooting steps. Steps are available in the article given
above.
Regards,
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