lol this is confusing! Dug out an old hard drive, formated it with XP it ran no problem.
Stuck in the graphics card and it froze.
Took out my brother's 7600GT from his PC and it froze too.
So it works without the graphics card on both hard drives yet the graphics card will freeze it on either (the new one having next to nothing on it - including no onboard graphics driver installed).
Can't test the graphics card as it has a silencer on it which doesn't fit into his PC but think it is something else if his working card freezes too?