I have seen this uninstall question and reply on one of the fraudulent websites offering an “avast package.” I don’t know whether this may be the source of the problems described by Cabinetdude, but it seems possible.

(quoted from that website–“avastsoft”)
“I can’t uninstall avast! via “ADD/REMOVE PROGRAMS” in control panel. What else can I do?”

“You can download our uninstall utility called AvClear or AvClear4 (it depends on the version of avast! installed on your computer) which will remove it. Please find more information by clicking here.”

There is no link on that website to any uninstall utility.

edit: added “missing link” statement inadvertently omitted