I'm upgrading from Windows 7 RC Ultimate to Windows 7 RTM Ultimate. Now I know you're not supposed to do that, but I really don't want to clean install. So I did the "Beta to RC" trick, by copying the setup files onto my hard drive, and changing that config file.
In any case, the upgrade will complete successfully, but when it reboots, the bootscreen shows and the windows flag pulses, but after a couple of seconds, Windows will show a BSOD. I don't quite remember what it said, but it was something about a "k-somethingamajig-.sys" After it performs a dump, it'll try again once and after that fails, it'll rollback. This is something like the 4th time I've tried, and it's getting sorta frustrating, considering how long it takes to upgrade.
I'll attach a dump file as soon as I find them.
In the meantime, here is my /windows/panther/setuperr.log
UPDATE: Okay, I have to confess that I just did something really stupid. When I tried to boot it, it started rolling back, so I cut the power, and when I tried again, it said, ovbiously, that a few things got corrupted. From what I can see, nothing major got corrupted, only a few videos, but it'll now just show up with a cmd window. Please oh please tell me there's a way to rollback.