Follow carefully what db is saying. He's a pro with this stuff.

I'm doing exactly that and no one program finds all the spyware. Each of the three finds different things at different times. Microsoft is the best, simply because it runs every night, automatically, and downloads its own updates, automatically.

And, he's right on the money on the memory. I don't think you can do much with 128MB. This one has 512MBK and it's barely adequate when a bunch of things are open at once.