Well so far there has already been a hole that was found and exploited in SP2.
Also, the "anti-virus" option of the security center sucks bad. I have had a few service calls relating to ppl that have the warning popping up about windows failure to communicate with your antivirus. I know some of them were using like Norton 2003 which is pretty damn popular.
Also, just to mention Dell. Yesterday a lady let me know that they needed help b/c evidently Dell tech support told her that the failure to communicate message meant they already had a virus on their brand new Dell and unfortunately they cannot support that.
Shitty companies and shitty service.