Hey Robinsan,
Which version of Windows is installed on the computer?
Step 1:
I suggest you to put the computer in clean boot state and check.
To help troubleshoot error messages and other issues, you can start Windows 7 by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts.
Refer the link below for more details:
How to troubleshoot a problem by performing a clean boot in Windows 7:
http://support.microsoft.com/kb/929135
**** Note:
After you have finished troubleshooting, follow these steps in the above article to reset the computer to start as usual.
Step 2:
If this doesn’t help, try uninstallingATI Catalyst Control Center: Monitoring program and reinstalling again and check.
http://windows.microsoft.com/en-US/windows7/Uninstall-or-change-a-program
Regards,
Savan – Microsoft Support.