In the morning I noticed some updates available, I went ahead with all the updates. After the restart a window popped up saying that the windows needs activation... I have Windows 7 Pro with legit serial no. but I found a Dell OEM Windows 7 ultimate serial no. I inserted it, did not work, but after restart it was updated to Ultimate. Now the serial is not working and the key from Windows 7 Pro is not working neither, previously was inserted the Ultimate one and downgrading is not possible. I tried using the latest Windows loader, I think the latest is 2.2.1, but is not working. Even the restore did not work. Any way to activate it without clean install? I have too much stuff to backup, no time for it right now. Thnaks