Diddyo

Just been installing Vista Ultimate 64x, doing well and told me needed to restart to carry on, so i did. As it started to load i get a blue screen 5 seconds into windows loading bar, so i decide after a few failed attempts to remove the CD-ROM, it worked and it passed blue screen and said preparing to start pc for first time. As it carried on installing i get another blue screen, so i put disc back in again and when it loads windows now it says "The computer restarted unexpectedly or encountered an unexpected error, Windows installation cannot proceed. To install Windows, click "OK" to restart computer, and then restart installation.

Now im at stage trying to find how to restart installation as it keeps coming back to this screen.

Any ideas on why this happened or how to restart installation?