You might not have to completely reinstall if it crashes. If it crashes at boot, just as you see the Windows screen, you might just have to repair the installation. To do this, boot from the Windows disc as with a reinstall, and then choose "Repair".
I had to do this after upgrading most of the parts of my pc. Basically, the pc is booting up, Windows is looking for the old components, and getting very confused at finding the new. Hope this helps, good luck.