Two Anti-viruses

[Danny2008]

I once installed two Anti-Viruses and my PC ran really slow, so I just kept one. However, at the time I didn't have too much memory.

Is that why this occurred or is it just that it's not a good idea to run more than one anti-virus?

[RNX2008]

It's best just to have one anti-virus, and make sure it's efficient. I'd say test run both for about a week, and lose the inefficient one. Use trials so that way you don't spend any $ yet, and once you're satisfied you can make the right purchase.