Here is a step by step tutorial on how to login into your computers admin account without using a password.
I have posted this tutorial as it happened to me once to forget my windows admin password and it was a very frustrating situation. You have to take into account though the fact that as you learn how to login into your computers admin account without using a password the same way any hacker that has physical access to your computer will be able to do it.
WARNING: I am NOT responsible for any expulsions or such if you do this at school/work! First, restart your computer.
Once you get to this screen, hold the power button on the computer until it turns off (no damage will be done, trust me).
If you did it correctly, you should get this screen. If you get something like “Windows did not shut down correctly,” try again. Otherwise, select “Launch Startup Repair.”
When you get this window, click on “Show problem details.” Scroll down, and click the link on the very bottom. Notepad should pop up.
Go to File/Open, and double-click your “Local Disk” (Mine is D:/ because I have a virtual machine. Yours will probably be C:/).
Go to Windows/System32. Now do EXACTLY as I say, or you MIGHT break the computer. Under “Files of type,” select “All files.” Scroll down and find “cmd,” then make a copy of it in the same folder (Ctrl-C, Ctrl-V). You should get a file named “cmd – Copy” or something like that.
Rename your “cmd – Copy” to “sethc.” Close notepad, and hit “Finish” to shut down your PC, or just restart it manually.
Once you get back to the login screen (where it says “Press Control – Alt – Delete.” Ignore my background, I don’t have that enabled), press “Shift” 5 times to open up the command prompt.