Windows 7 is a bloody irritating software.. the only positive about it is that it automatically downloads drivers. The MAIN downside of it is that it sees add on programs like  Signtools which acts as an interface between Corel Draw and a vinyl plotter as a threat. I have to disable my anti virus when I plug in a USB stick as any file that has been through my plotter gets automatically " cleaned" by W7.. or in other words - WIPED!.. Ive lost a few stencil files since having to use W7.. with XP?? Never had an issue.
My comp that I use for my plotter runs on XP.. home comp is W7... flick between the two without thinking and I lose hours of work