i have a box with installed and long-used Vista Yet it was once installed as Vista Ultimate and holds it within, at least in registry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion but perhaps in files as well. Now i want to *upgrade* it to Win7 Ent. I have a disk and a key for it. And it works for clean-install. But on this box i need an upgrade rather than reinstall. I have valid Vista Bus/Ent key, but not disk (that was the reason Vista was installed as Ultimate once ago). So i run VOATK and change the OS type to Ent. Retail (or Bus. Retail, no matter). I run slmgr -ipk ... and install Vista Ent key (or the same from My Computer / Properties) - ok I run slmgr -ato (or again same from GUI) - activation ok. I run slmgr -dli (or VOATK's view license menu) - it teels me i have Vista Business or Vista Enterprise ok. No i run w7 ent install disk - and it tells me it cannot upgrade this windows, only clean-install. Also My Computer's properties sheet claim Windows to still be Vista Ultimate. Frankly speaking, it seems that VOATK here not changed Vista edition, but made a kind of frankenbuild, partially Ultimate and partially Bus. or Ent. And different parts of OS treats itself differently now. I try slmgr -rilc - then activation got lost and no more can i input Vista Ent. key - it begins to say Ent. key cannot activate Ult. Vista. Perhaps original media, once used to install this box, only did have some files for Ultimate? On another box i once ago did that VOATK's change of edition and w7 upgraded quite ok. So how can i turn this installed Vista Ult, to be Vista Ent ? Will slmgr -ilc help me, if i get somewhere license file from MSDN Vista Business original DVD ? I just need to tempirary convert Vista Ult. to Vista Bus. or Ent. to upgrade it (not clean install) to w7 ent.