Tried Everything Mentioned in this Thread, Still No Luck
All the same issues originally as everyone else - upgraded to PD4 too fast and screwed myself. Tried the "official" cleanup fix posted in the KB5789 article on 11/26. No luck after a couple of attempts - same results as ajscorpio on 11/30. Tried the method he outlined on 12/3 as well. Still no dice. Even tried Fusion and had the same issue (activation problem in Fusion, not in native Boot Camp).
Periodically, while dorking around with the prl_boot file, I would mess up the native Boot Camp install as well and have to revert. Right now I'm back to a fully functional Boot Camp, and a Parallels that wants to be activated with reduced functionality.
I've got waaaaay to much software installed in Boot Camp to even think about reinstalling Windows and going through all the hassles with reactivating it all. I can live with it but it makes my OCD go wild... Any other suggestions?