My workstation came with Windows 7 so that's not it but I'm starting to think you may be on the right track. I'm wondering if there's some sort of software conflict. I've recently installed some new utilities and application and I'm wondering if that could be the source of the problem. Unfortunately I don't use the upload or download feature often enough to narrow down the possible causes.
What about you. Did it ever work on your system and, if so, what software or updates were installed before the failure started?