first of all im asking this question from a differen pc. i have an acer laptop and changed my password and work fine till i tried to restored my computer to an earlier date after which now i cannot sign in as the admin says my password is invalid.
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Sorry, but it is against forum rules to assist in circumventing any form of security. There is simply no way to confirm ownership.
You need the old passwod or you'll have to re-install Windows. You won't get hacking advice from anyone around here.... Oh no here comes Brett.... gotta go.
It sounds like you restored Windows to a previous state and its using an older cached password.
You can do a Google search for your issue. There are programs that will allow you to reset the Admin password.