Hello people. With the inability to use Daz's loader with windows 7 enterprise, I hoped to be able to switch to ultimate without the need of a format. Something that, at least a year ago, I thought it was not possible. However, while googling, I came across this utility: intowindows.com/downgrade-from-windows-7-ultimate-to-professional-or-home-premium-edition-using-windows-7-downgrader/ (sorry, can't post direct links yet) It supposedly lets you change your version without a format... with a single click (and the Windows Ultimate DVD)! Is this even possible? Could it work in an unregistered version? Update: It works! (at least worked for me!) So here are the steps I took. If you plan to try it out, by common sense, backup first, use at your own risk, at least wait for some more comments! I took the liberty of editing my original post with this info, I think it's easier to see. 1) I downloaded the first Windows 7 Ultimate x64 version I found and burnt a dvd with it. (I know you guys suggest a "clean" ISO, but the first one I got was the BIE one.) 2) I used MBR Regenerator to clean RemoveWAT and rearm my system once. 3) After the two reboots, I logged in Win7 Enterprise when I got the "your copy is not genuine" watermark 4) I ignored it and ran Windows 7 Downgrader. Just as the instructions say, I opened the file as administrator, clicked on "Downgrade to Ultimate" and then closed the app. 5) I opened the Windows 7 Ultimate x64 I burnt earlier (careful, through windows explorer, not boot), ran setup.exe and selected to upgrade. 6) I waited... and waited... and waited... and $#%@#$%$@#$ waited... 7) After about two to three hours (!!!) and a couple of reboots I now have a full working version of Windows 7 Ultimate... with my files and programs intact! (well, sort of, see problems) 8) Downloaded the latest Windows 7 Loader (the BIE integrated one is way too old I guess and ran it. Of course, the following is only for people who downloaded a BIE version, or one with an integrated loader! Whoever gets a "clean" ISO should only just use the loader once to activate his copy. 9) Followed the instructions in "Common questions and answers", that is, open loader uninstall/reboot/install/reboot/activated. Worked like a charm! I'm now fully activated, sticker and all, without anything missing from my system! Plus, all updates up to SP1 (including KB971033) installed without a hitch! Although I had to disable AVG2011 to install SP1, was getting an error if I didn't. Only problems I faced: 1) I had to reinstall my GPU drivers (msi gtx460), for some weird reason they were gone! 2) Some apps stopped working. Daemon Tools stopped working due to some SPTD issue. Uninstalling/reinstalling the app, and it now works like a charm. Asus PC Probe gave me an error popup on startup, (known error when upgrading OS) but it worked ok. Nevertheless I got rid of it. Also, all of my msconfig startup items were disabled, I had to enable them manually 3) (not really the app's problem but...) Careful what you download. I'm such an idiot that I downloaded a BIE version with updates up to 02/2010! So I had to reinstall every update since last year from scratch. Good job, took another two hours of my time! So, at the end of the day, apparently this app works, or at least it can work! Again, backup first, use at your own risk, or at least wait for someone with more experience than me to comment on the procedure, or even give it a try. I did not create this, I'm nowhere near computer literate enough to guarantee 100% success for anyone and I wouldn't like someone to ruin their installment of windows because of my enthusiasm.