SysPrep not Promting for Username

Hi there all, we are having difficulty with our sysprepping. After creating images for various XP’s (HE, PRO & MC)we are unable to enter new Username/Owner on the fresh indstall from image. It is going thru the motions like normal except it is not Prompting for New Owner name/Username when installing from the syspreped image file.
Has any one seen this problem and know how to rectify as MS wants us to pay them money just for them to look at the problem, which I find unacceptable.