Did you ever solve this issue? I'm in the same boat and can't boot windows normally. Safe mode works but that's about it. I uninstalled and drivers and then ran driver sweep. After driver sweep deleted everything amd the windows logo hangs at start up. Can't figure it out,
The card appears to have gone bad during shipping, probably got rattled too much. Swapping with another 5970 resolved the issue. I would recommend a warranty replacement if your card is still covered.