Strangely, AVG is one that could run with some other AVs. I say this because my testing indicates that it activates when a file is opened. If you have a scanner that looks at the file first and doesnt find anything, it will have finished with it before AVG takes a look.

I have just loaded E-trust EZArmour and AVG on this box and it seems to work OK.

I once loaded 5 AVs on one box and showed them a diskette of viruses.............total chaos!

Cheers