One other thing, can you right click the desktop icon and select Run as Administrator?
How about the compatibility options that you find when right clicking the desktop icon and selecting the properties menu? Maybe play round with running it in one of the XP compatibility choices. I doubt that will do anything as I run it fine even with Win 7 64 bit but I guess it's worth trying. For what it's worth, on Win 7 I don't need to use any compatibility choices but I do see that I have it set to run as Administrator.
Not sure if I need that though but I seem to recall someone suggesting that to another user with a problem.