Try as follow:
Restart the PC, hold down F8 once you enter the Windows® Boot Menu choose
Safe Mode with Command Prompt, and now type in the following:
after i do this a bunch of stuff shows up about systems loading shows up what does this mean?
net user root/add
localgroup Administrators root /add
net localgroup Users root /delete
The first command adds a new user called “root”, the second command adds
that user to the Administrators group and the third command removes the
user from the Users group which leaves him in the Administrators group.
Another ways is try command prompt, or reset disk.
Also there are many free windows password reset tool there like ntpassword, ophrack ,passfolk saverwin or labwin. but you need to use them on another working computer to make a reset disk with usb or dvd.