I found that sometimes it seems like vista froze, when really it is doing work in the background. Make sure you don't boot your computer, unless you let it sit for hours on end while installing.
Also, you can install at least a handful of times from the same disc without a problem. I had to install at least 3 times (although I never got windows to register on the first 2 tries). If you do have a problem, I know you can call Microsoft and explain the situation, and they will give you a new code right then, however, You have to be at the install screen and you have to have your old code handy.








