Guys usefull Microsoft :Windows Live OneCare 90 days trial… 
then u would wat to do abt da trial 
going by windows reputation this will sure be a hit but the effectiveness of this i am sure , is debateable .. except on Vista i guess .
heard its poor…in its ability to scan out things
guys i am sure 90% of us are using Windows…and in XP or VIsta…this is a great anitvirus …as with vista ..it does not slow da PC and give you total protection…u can try dis…