ok sorry about the confusion...as it stands i have a PC with XP (no sp2) Now I want to do an unattended install of SP2 on that machine using some of the answers I created in by winnt.sif file (or unattended.txt). i.e. I want to disable hearts, minesweeper and computer name (which I have done in the winnt.sif). At the moment the only way of doing this is to do an unattended install of xp sp 2 (using the /quiet switch) and then running reg tweaks to do all the stuff I did in the winnt.sif file. This is not as nice as using the winn.sif, hence I was wondering if you can use the winnt.sif on a machine with XP already installed, when I perform an update to SP2