HP Vista Disc

Everything went smoothly until step 3. When I load my Vista DVD, I do not get the same green screen. It tells me that 'Windows is loading files...' and then an HP Recovery Manager window pops up. It doesn't give me an option to 'Repair My Computer', it only tells me that I can click next to recover and recreate a factory image on my hard drive or I can click cancel. Clicking cancel automatically makes the computer reboot and open up Windows XP. Any help would be much appreciated. I believe this is due to the fact that HP did not send me a generic Vista disc, but one of their own. If the problem is not fixable, and I am not able to successfully dual-boot, I am willing to reverse the changes (if I could just figure out how to get Vista to come up again). Then I could just delete the partition that XP was installed on.