Assuming that the laptop works, get hold of an old XP disc from ebay and download the drivers and you're ready to go. The real issue is why it crashed in the first place. You can pick up better spec'ed laptops new for about 300 bucks. They have faster memory access, which for music is more important than the cpu speed.
All in all, unless you know why it crashed, I wouldn't bother trying to fix it.


Chris