I've ran out of unlocks many times, because usually when I have computer problems, they come in 2's (Install Vista, Unlock LFS, then Activate Vista which locks LFS, unlock LFS, reboot into XP, load LFS, try to unlock LFS to no avail.) But with a friendly email to the LFS Tech team, you can have that corrected in a day (due to my shitty timezone) and be able to drift the night away.