Turns out Windows errors can speak English. Who knew?
I was running Windows XP Pro x64 with SP2. Made a new partition, installed Windows 7 on new partition. On boot, I could pick Windows 7, or older Windows OS (XP Pro x64 SP2, basically Server 2003 SP2).
Try the following methods to access your account when you can’t sign in with your existing PIN. Reset PIN Sign in as a Global Administrator or another Admin account Uninstall recent Windows updates ...