You might try this. Boot with the installer disk in the drive and if/when prompted to press any key to boot from CD, do so. Let the installation start and get to the point where you would delete or create the partition. Don't actually do anything to any of the partitions. I believe at this point you should have an option (probably F3) to exit the installation. Press F3 and the computer should reboot. If this works properly you should have made Windows forget about the repair installation. If prompted to boot from CD DON'T. See if Windows will just boot normally.