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Im not sure if you know about this but my issue is that I forgot my windows 7 administration password. When I do the f8 reboot and then enter in the command prompt im told in the next screen to type something and then change, but it doesn't bring me there. Just straight back into the main login. So the other option is to use a disk but I don't have another computer to get the program. Is to there nothing else?
sorry to hear you've had issues although i must first explain that we are not actually Microsoft . This is a forum simply to help those that use windows and have an issue of some sort.
It's always better to create a thread in the forum proper as that way many more eye's will see it than back here.
You could try System restore if you have a restore point?