-Kaspersky Internet Security 2010 -- light and strong
-ESET NOD32 Smart Security Bussiness Edition 4.xx -- This AV eat alot of resources/memory RAM but strong enough to protect you
-Norton Internet Security 2010 (Advance Secure) -- Light and strong, i have never try it...but many positive comments
-AVG Internet Security (New) -- Better than previous AVG version
-F-Secure Antivirus 2009
-G-Data Antivirus 2009
-McAfee Total Protection 2009

Nb: I list it from the best one into the better one

All antivirus has stronger side and the weakness side

bit defender total security 2010 is the best

agreed. bit defender is what i use!

i like norton 2010 its dont make pc slow

someone has try Avast pro?

hm...Bit Defender 2010 make computer or Notebook slower....it's not recomanded for Medium Spec Computer or Notebook....
It's Recomanded for High Spec....Because it ate alot of Resource too....but i agreed for the security....it's strong

Hm....Avast????not bad....but it's not strong...Trojan can bypass it.

Quick heal anti virus..very reliable,u can try pctools internrt security.its good and ur getting a 1 yr license free..just google

thnks guys....very helpful im using quick heal internet securty 2009 v10

just a little bit.....slow update...it take a few hours

My bet would be Eset (Smart Security) its strong but doesnt make PC's slow - uses it on 4 computers - incl windows 7 32-64bit...The only thing is Homegroup in Windows 7 doesnt work, but a little fix does the work - go to Setup > Advanced Setup - Update > Advanced Update Setup > Enable Test Setup, and then go to Update and wait for the Update to install the latest Firewall Module. Restart PC and Workgroup works - If you have ESEt installed on other WIN 7 computer on your network do the same on other computers....

Personally i don't use a av on one pc i just use different methods. My recommendation would be nod32 as u have control when something gets quarantined. And it will protect ur pc and it doesnt really lag only when it does mandatory start-up scans. I hear trend micro security is good.

I use a mix of Avast Pro and Malwarebytes' Anti-Malware, I have found no problems with these and changing the serials with Avast could not be easyer than copy and paste. But you need to find out which one is right for you so I recommend trying some portable AV's of the ones you like the sound of!