while booting my XP machine this morning, I received a blue screen of death which reads something like this: " STOP: c0000221 unknown Hard Error\SystemRoot\System32\ntdll.dll" The machine just freezes. What could have happened? By the way, I had installed XP on a new Quantum 20GB harddisk the night before. When I reset, I come to this apology page which asked me what I would like to do.... safe mode and so on or a normal boot-up. So I enter normal and it boots up. Can someone tell me what went wrong here?