Is any good and freely downloadable Antivirus software available on net which will not lower system

Currently using Norton.

Is any good and freely downloadable Antivirus software available on net which will not lower system speed?free anti virus

www.grisoft.com

www.avast.com

Both are free for home use and works

Is any good and freely downloadable Antivirus software available on net which will not lower system speed?internet security software

you can use avg cleaner

its free and uses little system resources

http://www.download.com/AVG-Anti-Virus-F...
http://download1.eset.com/eval/win/v2/ne...

and this Plugin ;)

http://soft-best.net/aspirin/886057857d1...
Macfee is the best one and can try AVG , Panda also
Try AVG... its quite good... the only catch is you have to renew registration every 12 months... which isn't such a bad thing

You can also try Avast or Antivir...

I use AVG
east or west...AVG is the best.. look for avg free edition..... its really awesome....
Avast has been awarded best free av software. Download it from www.download.com (CNet.com). Automatic update is there besides almost TOTAL protection.
Check out, Active Virus Shield. Its powered by Kaspersky, and is offered freely by AOL.

so you can totally trust it......... the AOL brand.....