SUPERantiSPYware Free edition. Updated it every day, scan every evening. Great program without any bloat. I love it. Avast free and AVG free often grinded my computers to a holt.

Webroot Secure Anywhere

Security Essential is way sufficient.... The real problem is often between the chair and the keyboard.

Don't use one, but I think I might now. This poll has been helpful!

I use avast as it is free. never had any problems, used to use paid version of bitdefender.

I use Panda's free version. Not as many features as some of the paid versions out there but does what I need. Combine it with some good anti-malware tools and common sense when browsing the net and you should be just fine.

The only anti virus I used is AVG

But I know how efficient Kaspersky is

Kaspersky all the way

Avira is my choice. The truth is i got lucky so far and only once had a serious virus problem, which avira sorted out relatively easily. So my opinion might not be quite definitive.

i would recomand Bitdefender...