Chums few days ago I stumbled upon this thread on Tech net :
inconsistent USB support issue Win7 x64 RTM
The thread starter there was also sharing the same problem which I also faced. So it validates my doubt that it's gonna be massive problem for Microsoft b'coz it's not limited to "some user"; despite all their precautions and getting good reviews (thanks to the money they paid for this purpose) they've goofed up with their OS once again. Windows 7 is gonna be another failure of Microsoft. Even after getting so many jolts they r not learning their lessons. Seems only God can save Microsoft!