Great product, very highly rated and crucially doesn't bog down your computer.
This is the best AV software I've used. Come across this deal as my license is up for renewal.
Total Security is top of the three security packages offered by BitDefender. It includes automatic backup, a registry cleaner and file shredding facilities.
Although this is the 2009 edition - 2010 was only released yesterday - there appears to be minimal difference between the two. Also, I've had no problems using registration keys from old versions with newer editions in the past.