Microsoft Security Essentials has now been officially released (conveniently just before Windows 7 release, perhaps?).
I switched it out with Kaspersky about a week ago and so far so good. Kaspersky for Windows 7 is buggy and causes many slow down issues, it may be a beta but at this close to the October release date it’s a pretty poor offering. MSSE works like a charm, no slow down issues, virus tests on YouTube show excellent results, plus the best thing is it’s completely 100% free.
Find it here: