I've had a recent new problem. If I right click a single file and choose to scan the file with Avast or with AVG Anti-Spyware, nothing happens (it used to work). But if I highlight 2 or more files and right click choosing Avast or AVG Anti-Spyware, the scan takes place. On the other hand, I can right click on a single file and choose to scan with A-2 Free or create a zip file with Win Zip, and they work fine. Anyone have any ideas about this? I am using XP SP2 with all updates.