Please help

I downloaded the Vista OS from microsoft, have the key, and have tried installing twice so far with the same result... 
It freezes during the 'finalising installation' stage

It boots from the disk I made fine, accepts the key and installs fine, rebooting a couple times during the install process as it says it will...
But once its installed everything, updates etc, and gets to the 'finalising installation' stage, it then reboots again, and the displays the XP like status bar scanning across the page....this scans back and fortha couple times, then freezes right there, no longer scanning or going any further?

Have I done something wrong?
Is the disk I made corrupted?
Please help