This looks pretty promising...Free and light-weight anti-virus/anti-spyware software from Microsoft. Some people say it's even made their PC run a bit faster too when compared to their previous software.
I'm trying it myself now (replacing the free versions of Avast and Ad-Aware). It's only a ~8MB download and I must admit that it looks pretty good so far. My first scan seems to be running just as fast as any other software, but a nice bonus is that it doesn't seem to eat up a lot of memory or CPU when it's on.
The only "catch" for some people is that you must be using a genuine version of Windows. I'll be using it from now on—only time will tell if this is good protection in the long run.
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