OK, Numinous or AaronXP or DaveXP or anybody equally brillant, I have successfully combined info from all of you to get what seems to me to be a perfect, fully patched unattended install of XP. Runs fine and passes the Windows Update test. However when I run "SFC /scannow" as a test, Windows wants the XP SP1 CD to add files to the DLLCACHE directory. I'm suspicious of this because the hotfixes, rollup and Directx etc are not really "Slipstreamed" as you know. Anybody have any ideas on how to get the DLLCACHE directory in sync?