In addition to Spybot and AdAware I also run WinPatrol which has a free version at www.WinPatrol.com but you have to have a clean machine when you install it because it works differently than the others. What it does is to take a snapshot of your system at the time you install it and then it alerts you anytime something tries to write to your registry and asks you if you want to let that happen. So far it has alerted me several times when some malware wants to install something.

Tom

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Bigger is not always better