Just in passing, I mention that I was unable to ever get my Logitech MX-Revolution to run properly on my Supermicro C2SBX motherboard. It doesn't use the new "unifying" USB receiver, but rather the old "dedicated" mouse-only USB receiver.
Anyway, there was apparently some type of conflicting built-in receiver or something in my motherboard. The Logitech Setpoint mouse software just could not control the mouse by itself... as if it were fighting with a second piece of hardware which had "seen" the wireless mouse and wanted to control it as well. The mouse movement would "stick", and then "break loose", etc. Simply unusable.
I never could figure out what to disable, either in the BIOS or in Windows (both XP and 7) to make this work. I finally had to just go back to a simple MS wired mouse on this machine, and move the wireless MX-Revolution to my second machine which had an ASUS P5Q3 board, and had no hardware conflict or problem whatsoever. MX-Revolution works perfectly on this machine!
So, might there be some conflicting wireless receiver built into your motherboard on this particular machine... that is perhaps not compatible with this new "unifying" USB receiver? Can you disable it in BIOS? Does it show up in Windows 7's Device Manager, so that you could "disable" it there?