|Virus scans for viruses...you need to run anti-malware/spyware scans as well.|
Plus you need to be able to clean all the cache files and temp folders and older restore points and the likes as part of a cleaning proccess. Less than that is like sweeping the dirt under the rug as you only partially cleaned your system....
This problem is generally associated with spyware/malware but can be caused by the improper un-installations of certain programs as well and from corrupted files in which case there is no protection against.
Try removing and re-installing the program.
If you have the original installation disc then you can try to use system file checker...or try it without the disc as sometimes the scanner works from the stored windows folder.
start > run and type in the box
Notice the space infront of the slash!
In reference to 11/05/2008
"So this is how liberty dies. With thunderous applause."
- George Lucas