Please uninstall the following software for testing purpose. You may install it back if we know they weren't causing any problems.
Start Menu\Programs\Norton Internet Security Public:Start Menu\Programs\Norton Internet Security Public
Start Menu\Programs\Norton Online Backup Public:Start Menu\Programs\Norton Online Backup Public
Start Menu\Programs\The Hacker Antivirus Public:Start Menu\Programs\The Hacker Antivirus Public
Run these tools and delete anything they find:
ESET online scanner:
Download a copy of Microsoft security essentials and Malware bytes free. Make full virus scans with them.
Do not start the free trial of Malware Bytes; remember to deselect that option when prompted.
Run a full scan with both (separately) once downloaded, installed and updated.
Run the System File Checker that scans the of all protected Windows 7
system files and replaces incorrect corrupted, changed/modified, or damaged versions with the correct versions if possible:
Run Disk Check on your hard disk for file system errors and bad sectors on it:
Update to the latest version of your graphics drivers
from Device Manager or from the manufacturers website.
Keep us posted.