How well does spybot search n destroy work?

I have this program.. does it work well? and i dont think i have any viruses at this point.. but then again i dont now.. but i always delete my browsing history and cookies is that good? and ive already tried AVG and it sucks cause it made my computer run ten times slower.. and i need something free that actually... show more I have this program.. does it work well? and i dont think i have any viruses at this point.. but then again i dont now.. but i always delete my browsing history and cookies is that good? and ive already tried AVG and it sucks cause it made my computer run ten times slower.. and i need something free that actually works and wont screw up my computer.. and suggestions?
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