Is this a normal workgroup or active directory domain? Because when you said your have a server and that your wife can log on the laptop and desktop with her user name I assume it was an active directory domain you have at your home.
"failed. The error code was: 3221226036" Just said she tried to logon to an account that was locked. It could of been locked because it expired or to many bad attempt at logging in. I see like 13 attempts.