TFC - Temp File Cleaner by OldTimer http://www.geekstogo.com/forum/files/file/187-tfc-temp-file-cleaner-by-oldtimer/
When the work is done, you can delete it

We're inclined to continue using Avast rather than have to embark on a potentially maddening experiment with yet another AV program. On the whole it seems like Avast has performed better than our previous AV programs over the years (Norton, McCaffey, and AVG). But this situation is both alarming and vexing.
Did you uninstall these? Did you run vendors removal tools to clear all leftover files?

General: Uninstalling a third-party antivirus software http://www.avast.com/en-us/faq.php?article=AVKB11#artTitle