Win 7 and sidebar
Yep. I remember back in October 2009 when I downloaded the thing and thought there was no way it would work on a 64 bit but honestly, it works better than anything else. Never crashes, always starts, never causes a single error message. Damn it works more smoothly than my anti-virus program.
Also had it back when I had XP - only complaint there was it used up too much memory but I only had half a gig to start with anyway.
Give it a shot !
T