There are a couple of possibilities here: 1.An app is interfering with the password box appearing  2. A user account is corrupted. Possible isolation of problem: 1. Boot into safe mode and see if the problem reoccurs. If it does not, then reboot and try normal startup but loading only one app at a time until you find the one causing the problem. 2. If you still can’t log in, do a Windows restore.
I can't log in to my Windows account, nowhere to put password.
"DS: I can't log in to my Windows account, nowhere to put password."