Removing partial install of 2nd os

Question

I have a computer with XP Home that I started to upgrade to XP Pro. During the install something happened to the cd drive and it stopped reading the disk. Now when the computer restarts I get a screen asking which os I want to use XP Home or XP Pro Setup. At this point I just want to remove the XP Pro Setup since my cd drive no longer works. How can I do that?