Running several AV programs at the same time is VERY BAD!
AV programs often control (to a lesser extent) what program can do what, that's what they're there for!
If you start running 2 at the same time they start conflicting each other on these matters, and this can often lead to crashes or even viruses getting through because both AV blocked off each other's internet access (yes, I've seen this happen many times before on work).
As for Ashareth (the dude who got banned) he might have been an asshole, but he was right.
Ignoring him just because he doesn't use nice words is only going to disadvantage you.
@Erona: You went defensive in that you didn't want to believe him even though he gave correct info.
PS.
If you REALLY wanna make sure your PC is virus and spyware free I suggest the following:
Get a normal AV program, AVG, Avast, etc. There's tons of free ones out there and even more with a subscription.
Then get a cloud scanner (like hitman pro:
http://www.surfright.nl/en/). This is ONLY a scanner (does automated scan of your PC when it starts, is VERY fast and hardly uses resources) and is always up to date due to the cloud connection (
http://en.wikipedia.org/wiki/Cloud_computing).
Then contact your internet provider. Often these provide a AV service that scans files before they come in (much like a spam filter) and actually ADDS to the security of your system.
I hope this helps.