Please do this to solve the problem you are experiencing:
* Run this program: http://download.spamfighter.com/VIRUSfighter/Tools/VFRemover.exe
* Wait until the program completes and asks if you want to sent the logs to the support team (choose "No").
* Restart your computer.
* Reinstall VIRUSfighter from here:
http://www.spamfighter.com/VIRUSfighter/Download_Download.asp