HI! I have a problem with the validation on my windows 7 ultimat. Befor I had windows vista home basic. I uste the perfekt instruktion to install windows 7 on this forum. I had no troble to validate the windows 7 ultimat, and every thing worked fine. But my qurosity of windows 8 enterprise was to big so I tried to instal it. But after that the windows 7 is no longer validatet. I have formated the windows 8 and made a knew clean instalation of windows 7, it did not help. Then I instaled vista again, but vista kills me, I thot that maybe if everything was the same it would worke again. So after reinstalation av vista, i tried to instal windows 7 ultimat again, but when I put in the validation key I'v got thees error code: 0xC004E003. I know I hav read something about it in this forum, but I can not find it back Please can enyone helpe my??????????? I am from Norway som my engelish writening in not very good, but i hope it is understandebel. I can not go back to use vista, I hate it!!!!!!!!!!