Cause:
This issue can be caused by any of the below possibilities.
1. Hard disk drive is short on available disk space.
2. Several software programs have been installed/uninstalled leaving behind bad files and/or confusing the software.
3. Data Corruption.
4. Computer is overheating.
5. Corrupt OS.
6. Bad Hardware.
Solution:
1.Not enough hard disk drive space
Verify that there is at least 200-500MB of free hard disk drive space. This available space allows the computer to have room for the swap file to increase in size as well as room for temporary files.
2.Hard drive corrupted or fragmented
Run Scandisk or something equivalent to help ensure that there is nothing physically wrong with the computer hard disk drive.
Run Defrag to help ensure that data is arranged in the best possible order.
3.Background programs
Remove or disable any TSRs or programs that automatically start each time the computer boots. See document CHTSR for additional information. If you're wanting to see what programs are running in the background, how much memory they're using, and their CPU usage open Task Manager. Also, if you are running Windows 7, you can run Resmon to find out which programs are taking up a lot of space.
If you've got an anti-virus scanner on the computer, spyware protection program, or other security utility make sure it's not running in the background as you're trying to work. Often when these programs begin to scan the computer it can decrease the overall performance of your computer.
4.Hardware conflicts
Verify that the Device Manager has no conflicts. If any exist resolve these issues as they could be the cause of your problem.
5.Computer or processor is overheating
Make sure your computer and processor is not overheating, excessive heat can cause a significant decrease in computer performance some processors will even lower the speed of the processor automatically to help compensate for the heat related issues.
6.Erase computer and start over
Finally, if none of the above solutions resolve your issues, it is recommended that you either reinstall Windows
source :http://www.computerhope.com/
