Forgotten Password

Is there anyone who can help me? I need to reset a windows 7 password without formatting the machine and loosing all my files.

You may ask how I forgot my password, but the truth is that this computer is not mine but my friend's. He lost in the army of something, I don't know.

I'm the one normally with solutions but this time I'm out! All I know is that I need to have a way to get out of the situation and get he password.

Anybody body to help?
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