Sleepless... honestly... all the big-name Anti-Virus software suck. Get AVG (VERY light weight and is the top recommendation on every guru's list of PC apps to have.) or AVAST... I havent tested this one out, but it seems pretty credible.

Oh, and both are free.............which i should note that 95% of the best software out there are either free or open source. I have honestly never, in the past 4 years, had to spend a dime on commercial software. (Xcept for biz software that I am required to have for my job.) I can always get the equivalent or better open source or free version.