I'd say this was around the time that the 8800GT was having some lots of issues with compatibility, cause when I first got mine they had some screwy drivers and half the time they didn't work on Windows systems. Let alone anything else. The GT's were kind of an odd ball card. Everyone else had GTS's or something.
But, I've always ran nothing, and just keep a back up hd and throw all my important stuff on there. I reformat every 5-6 months IF I have to. It's not worth it trying to run silly firewalls or anti-virus spyware stuff on a personal PC. Run firefox or google and be done with it. But, if I'm working on someone's PC and they request some sort of combination. I usually go with Free AVG, and Adaware. They're pretty rock solid and they're free. But, nothing speeds up your pc with software really. Defrag and stuff like that if you really want to speed it up without reinstalling your OS.
Predator - OLF - Cyclone