[Dahak9]

I'm having a problem installing XP x64 onto a custom built PC that I just finished putting together. But when I attempt to load the OS after 'Verifying DMI pool Data' appears I get the error 'disk boot failure, insert system disk and press enter'. At first I thought that it might be a boot priority issue so I changed that around a few times and nothing different happened, so I also verified that the SATA HD and cd/dvd-rom that is in it are being verified by the POST which they are. I also checked the BIOs and nothing is wrong there. I can't figure out what the problem is. Can someone give me some help?