Hi physalis2099,
Thank you for using Microsoft Windows Vista Forums.
You need to update the latest video and graphics driver from the manufacturer’s website.
If that does not work, let us perform System File Checker (SFC) scan which will help you in resolving the issue.
To determine whether the issue that you are experiencing is caused by one or more system files that are used by Windows Vista, run the System File Checker tool. The System File Checker tool scans system files and replaces incorrect versions of the system files by using the correct versions.
Follow the instructions in the link below to run SFC scan.
http://support.microsoft.com/kb/936212/
Please post back and let us know if this has helped to resolve your issue.
Regards,
KarthiK TP