Any recommendation for a free virus protection software?

[Mason Workz]

I'd have to say no to the main ones.

AVG: Irritating ads shown on bottom of main console.
Avast: Hogs RAM and CPU (newest one did for me at least)
Comodo: Forces you to send EXE files "to their labs" with the check box greyed out. Sometimes you can uncheck it but I think you ALWAYS should be able to.

Personal experience. I use ClamWin but it's not very good at all. It never finds anything.

As for Avira, I haven't used it in years so I have no bad opinion on it right now. It looks Comodo-ey.

[Xeogred]

Microsoft Security Essentials.

When compared with AVG, you realize what a huge strain on your system resources AVG is -- not to mention, you get better protection with Security Essentials. Any computer that comes into my shop with AVG, it's one of the first things I remove to improve system performance. When they get their computers back, it's always "wow, what did you do?!".

I've been using this for awhile now on my Win7 desktop PC and I'm pretty pleased.

Previously on my XP laptop, I had some nasty viruses. I'm talking stuff like Virut, which was so hardcore I had to reformat a few times until I found an excellent bootable anti-virus program that destroyed a lot of junk. It was Dr.Web LiveCD or something, really weird sketchy name but it saved me the hassle of reformatting. After that I started using Comodo and it was excellent! Never had a single problem with my XP laptop afterwards, although the program can be extremely strict, but I didn't mind since I had so much trouble with my laptop off and on previously.