I got a message about old or unreconized files and needing the Windows install CD to replace these files when I ran the installed O/S for the first time. I click canel and the system seems to be ok for now, but I don't know if there are any surprises down the road. I only got the error box once when the desktop showed for the first time after the instalation. Any ideas? Hope that made sense. This is XP Pro w/sp2 using most of the options in nLite (tweaks/services etc.)