I have win 7 ultimatte 64 bit and tried installing windows xp mode and virtual pc and it would not run because my laptop pentium dual core processor can't handle it. It sucks because I have to pull the MSC-400 out of the rack everytime I need to upload. I guess I would have to install win xp in a dual boot configuration. URC is never going to make a win 7 64 bit driver available.