not a clue as you don't give any details of your equipment.
At a guess I'd say something is wrong with it.
OK, being a smartass aside, mate, how the hell are we supposed to troubleshoot with the little information you have provided??
How about some detail, please.
Did the laptop originally come with Vista?
Which version of Vista?
What are the laptop specs? e.g. processor, amount of memory etc
What is the BSOD error message?