So last night I was securing an HP AIO computer because an intern was coming in today. I created a password for my local account, then changed it to a PIN that works just fine. Here's the rub: I also created an admin account called Administrator and even wrote the password down but it will not work for anything. I've tried so many iterations! Now I can't make ANY system changes without being prompted by the Administrator account. Can't even access CMD! Please help! I tried booting via Hiren's with Kon-Boot but it only runs up to Win 7. Many thanks!