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What would be the definitive answer to slipstreaming SP3 on XP w/o any SP? The reason I am asking is that although the slipstream process completes without errors and that the resulting CD image can be installed correctly, there is still the possibility of some malfunction. In an MS VirtualPC session, I installated XP PRO Retail w/o any SP. I then attempted to install SP3 (using the same exe I use with nLite) but I got an error message stating that the current OS must be at SP1 or greter. See attachement image. This means to me that MS cannot update XP PRO w/o SP with SP3 for unknown reasons. Why would it be OK to slipstream it? Those two methods should be functionnaly equivalent. One could question how cumulative SP3 is. I wanted to see what updates Windows Update would list for XP Pro w/o SP, but I would had to perform an activation which I didi not want to do at this time. I do not have a n XP Pro Retail @ SP2. Edit: I just found the answer in this post: http://www.msfn.org/board/windows-xp-sp0-s...st&p=761207 *** Just ignore my question ***