No anti spyware programs A-Nonymous? Don't think thats such a good idea. I use AVG free antivirus Zone Alarm free firewall, the windows one only works one way so its pretty useless and Superantispyware and AdAware 2007. Thats one anti virus, one firewall and two antispyware.
A-Nonymous you can add programs like AdAware easily enough as the free one does not run in the background and therefore doesn't slow the PC up at all. It only runs when you choose to run it, I run a scan with it once a week. Superantispyware is good but does run in the background and therefore does effect your PC speed. But theres quite a few others that only run on demand.