Hi BillJohnstone,
1. Have you made any changes to the computer prior to the issue?
Follow the suggestions listed below for a possible fix:
Step 1: Boot into safe mode and check if the issue persists.
Start your computer in safe mode
http://windows.microsoft.com/en-US/windows7/Start-your-computer-in-safe-mode
Step 2: If the issue does not occur in safe mode, you may put your system in clean boot state (in normal mode) to troubleshoot the issue.
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.microsoft.com/kb/929135
Note: After troubleshooting, make sure to set the computer to start as usual as mentioned in Step 7 provided in the above KB article.
Also post screenshots which may help us to understand the issue much better. You may refer to the following link on how to post screen shot.
How do I: Post a screen shot on this forum?
http://answers.microsoft.com/en-us/windows/forum/windows_7-security/how-do-i-post-a-screen-shot-on-this-forum/c86de820-c620-401c-a804-9f6337cd3053
You may also open event viewer and check if there are any error codes or information related to the modules causing the issue.
Open Event Viewer
http://windows.microsoft.com/en-US/windows7/Open-Event-Viewer
What information appears in event logs (Event Viewer)?
http://windows.microsoft.com/en-us/windows7/What-information-appears-in-event-logs-Event-Viewer
Reply with more information on the issue so that we can assist you in better way.
