how to get into locked desktop with singular user and no reset disk

[Windows 7]

I haven't used my PC in several years and forgot my login information. I don't know what kind of windows is on it and I don't know the password to get in, I'm not even sure what email is associated with the account. when I select the forgot password option, it says the only option is a reset disk which I don't have. how can I get back in to the PC?

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