What kind of CD is your XP-Pro CD, bios-locked or generic and what service pack? if the cd is bios locked you will have to delete (or modify the i386\winnt.sif file) and possibly replace the i386\oembios.??_ files. If the CD has no service pack you will have to slipstream SP2. If the CD has SP1 you can't use it. To determine what service pack is on the CD look for a file named WIN51IP.SP? in the root of the CD where ? represents the service pack level. In order to create the CD set you MUST have the following files: MEDIACTR.CAB, NETFX.CAB, SONIC.CAB, and PLUS.CAB, you may also need OEMBIOS.BI_ (or .BIN), OEMBIOS.CA_ (or .CAT), OEMBIOS.DA_ (or .DAT), and OEMBIOS.SI_ (or .SIG).