I'd start with reading the license that came with that OEM version. It might well be it's tied to the original PC you bought. Then it's illegal to use it for this totally new one. If that's the case, start buying a new license.
What version of XP is it, by the way? Original, SP1, SP2, SP3? And what kind of a disk (ATA, SATA)? What boot device did you select?
In case of error messages, it's essential you post the full and litteral text of the message (without typo's) and not something like it.
Just built my own system ...Brand new i7-920,asusp6t delux oc. edition,3Gb Corsair dominator 1600 (in triple channel config)Ati 4670 west dig 320Gb HDD(16Mb cache)cooled with a triton 81 also secondhand and rather old but servicable CD-RW with a Corsair TX650W psu all in a Thermaltake Shark case... I have finished the ststem and was supposed to be getting a retail version of vista ultimate w/sp1 but ebuyer screwing me around anmd so I want to put tyhe home basic oem I got with my first bought pc 18 months ago but when I boot up with the disk in the CD RW it just says select proper boot device and press any key ( or something like that)