You can, but to run the 2nd CD you will have to have an exact drive letter and path your CD-ROM in your batch file on the Windows XP CD. (This can be a problem if you decide to use your custom CD on someone else's PC that may have different drive letters) e.g. instead of %systemroot%\install\Applications, you will have to use X:\Applications\ (X:\ being the CD-ROM Drive) Long reply was here Realised it would benifit more people in a new thread, I'll call it Optical drive variables & second CD install LINK HERE