AFP: Microsoft releases free computer security software
AFP: Microsoft releases free computer security software.
I've been using Microsoft Security Essentials (MSE) for over a month now, and it seems to work pretty well. It's getting good reviews from the security community, so I think it will be a permanent replacement to the Zone Alarm software I had been using.
You should enable the automatic update feature, since there is no reason to wait to install the latest patches for Windows, in my case XP. MSE also seems to be less of a burden to the processor than Zone Alarm, which seems to have gotten bloated in its maturity.