I downloaded the RC from the official windows site. Double clicked it, and it appeared obvious that it was going to take quite a very long time so I didn't stay in front of the pc. When I returned like an hour later I found a message on the monitor saying that the update hadn't installed and I was to click 'ok' to roll back the installation, which I did and it took more than 15 minutes... Anyone can help me on why it didn't install? Like for example should I keep my original XP disk in the drive (I've got a legal copy and all)? Or anything else which I might have missed? I know I can just retry and experiment myself, but I thought I'd post here first just in case someone can help me, before I waste hours not being able to use my pc! Million thanks!