Sorry for the delayed response, please clarify the following:
1. When does this error message shows up? Does it occurs randomly (or) exact at 51%
2. What is your default browser? Firefox (or) Internet Explorer?
3. Click on Start> Run> Type temp> OK> Clear all the temporary files
Reboot the computer and check the scan status
1. Can't tell since I wasn't looking when it showed up.
3. I'll do what you told me and then I'll let you know.
Thanks a lot for yor help.