McAfee Virus Scan, McAFee Firewall, Spyware Nuker, NoAdware, Ashampoo Antispyware, Windows Defender.
All of the above except Windows Defender cost money. I have McAfee Security Center so that's why I have those two McAfee software. The Security sweet comes with a privacy protector and spam blocker, but the spam thing doesn't allow me to recieve any emails at all and the privacy thing just screws itself up on me.
Those are all of the ones I use on my rigs. All are very good.