A successful,but unsuccessful integration with SP1?………..

Hi Guy`s,I`m new to these parts.All i can say right now is Greetings.As for my dicussion headind,I managed to integrate SP1a in with my XPCD,However when i went to try installing it onto my second hard drive as a duel boot installation,the original install key some how failed to take. a prompt appeard saying it`s an invalid key?. Would anyone know of this happening them selfs.Other than that,i`ve used nlite to create a cut-down XPcd,Removing most built-in hardware drivers as i have my own cd-rom cds with there own supplied drivers.Is it possible to integrate, say my RADEON ATI Driver into the XP Created CD?.