I haven't piddled with Win8 at all, but If it runs on NTFS you should be able to boot off a Linux live CD or UBCD4Win and reset the password. Unless, of course, you're talking about a BIOS password.
Recovering a lost password If you or a user forgets or loses their password, there are a couple of things you can do to reset it: If you’re using a Microsoft account, then you can administer your user account online. Simply go to the webpage and there will be an option to change your password. If you have another administrator account set up, use that one to change your password. If you are using a local account, you can use your password hint to remind you. Perhaps the best thing you can do is a little disaster prevention. You can build redundancy into your logins by also setting up a picture password and PIN. That way, even if you forget your text password, you still have two other login methods in your back pocket. Otherwise, if you’ve tried all these suggestions to no avail, then you might have to reinstall Windows.
Klein, Matthew; Heddings, Lowell (2012-10-23). The How-To Geek Guide to Windows 8 (Kindle Locations 2552-2558). How-To Geek. Kindle Edition.
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