AYchan.com

Microsoft may silently push SP1 to computers running Vista, so better remove those “non-SP1 compatible” cracks such as the Paradox OEM Emulator crack.

1. Run regedit and search for a key called OemBiosDevice. There should only be one. Remove it.
2. Delete \Windows\System32\Drivers\royal.sys
3. Restart

Now search for a crack that is SP1-compatible, like Windows Vista All Versions Activator 2.1.2.1.2 final.