Kermit posted one of the 2 most used programs I run and this
http://www.safer-networking.org/en/download/index.html being the second.Adaware is great for ad ware but you really need a malware program also so you really should run both.Spybot has a feature called teatimer which runs in the tray and if anything attempts to write to the registry it will popup and ask if you want it to.This prevents highjackers and a crap load of other head aches.Btw update both weekly.
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