When I was blackmailed into using McCrappee by my uni's IT people (or lose 'net access), I ran into a pernicious problem: when gaming (or doing something else that liked a lot of processor time), I noticed that it stuttered oddly. Being the inquisitive person that I am, I fired up the task manager and saw (to my surprise) that SCAN32.exe was eating up about 30% of my CPU time... and this is after I shut the activescan off.

I've had a virus-scan take over twelve hours because the SCAN32.exe (started by SYSTEM) was stealing processor time from SCAN32.exe (started by my username) and I didn't realize it.

And short of nuking the process every time it crops up, I can't find a way to stop it. And no, it isn't autoloaded at startup, either.

%^$# you, McCrappee.

EDIT: WinXP SP2 box, running the corporate version of McCrappee.