I personally boot back into my XP install to capture the drive Vista is installed on. 1. Install Vista to a secondary partition. (not the main boot partition) 2. At OOBE, don't do anything and type CTRL-SHIFT-F3 to get into Audit Mode (this is a must) 3. When in Audit Mode, don't close the Sysprep window and install SP1. Let it restart however many times and do its thing. 4. When SP1 is completely installed, in the Sysprep window select OOBE and Generalize and to shutdown the system and select to apply those. Vista should then start shutting down, cleaning out hardware data etc. 5. Restart into XP/another Vista install/WinPE (I really doubt it should make a difference which one you use but I booted back into XP) and run: imagex /compress maximum /flags "Business" /capture d: c:\install.wim "Windows Vista Business" replacing the drive letters etc. That, for me, works. That method has also worked for many other folks I know to get a slipped SP1 install. vLite against that new install.wim. Not as many have tried this one compared to just Reverse Integrating it and getting a full install.wim, but I have tested it with every build (except Beta 1, just didn't have the time) and have always had success. As I said though to MagicAndre1981 in a private message, this is a non-issue nevertheless, no one would want to use Reverse Integrated .wims over the actual slipstreamed SP1 media that MS will release and I'm sure obtaining those from MS or from your OEM or buying a $5 Vista disc update thing etc. won't be too difficult. Question: Does the above mean that, after copying the RTM Install disk to a temp file on the hard drive, you can simply delete the install.wim file from \spources and copy/paste the new one in; then run vilte??