Yeah, the specific fixes are: - Slipstream update.exe directly (when you extract SP) - Slipstream XP SP3 into XP RTM (SP0) under Vista, CDKey issue Both of them rare so better be silent and deadly. Hm, i am pretty sure that i still have the CDKey issue. My host OS where i run nLite is Vista Ultimate 64bit. I used nLite version 1.4.5.1. (downloaded today) I am trying to make a nLited version of XP 64bit SP2 and the ISO i am using as a base is "XP Professional x64 Edition", SP2, (version 5.2.3790.3959) Am i doing something wrong or does the issue still exist? Thanks for any help. Regards. Like nuhi said here, please re-download nLite and build a system from scratch.