anti virus software (again)

So yeah I dont want to renew my norton subscription cause its being a pain in the ass blocking msn and my ebay and such it did not do that before I feel its just anoying me to get me to renew it and I take it personally and refuse to renew norton on those grounds .

So are there any GOOD free anti virus scanners software out there ?

Antivirus are only useful to eat up your ram when you know what you are doing (and do no warez especially), but let's go :
-Avast
-Linux