I just upgraded from Windows 7 to Windows 10 using the free upgrade. Initially during the upgrade and configuration, I was using my account or profile. However, didn't see my wife's account at login. After install and setup was complete, I was updating a few programs out of date due to the upgrade, restarted, and at login only my wife's account was present. No option for me to login. I looked in the Settings/Accounts/Family & Other users and there isn't anyone else listed except her. I still have a file under users on the C drive but not sure how to fix this without having to create a new account. There is also a profile for my account under System Properties/ User Profiles. During initial setup when I was logged in, my desktop setting were exactly how they were with Win 7. So, no clue as to why my login profile is no longer available for login or user switching. Thanks
I had the same problem.
Create a new password or change the password on the account that Windows 10 restarted on?
My computer had 2 User Accounts; 1 admin and 1 standard. After installing Windows 10, the computer restarted into the Standard User Account.
The Standard account had no password. I don't know if this is why the system restarted using it and didn't show a login or start screen with the 2 previously existing accounts but it did?
Nonetheless, When I used Computer Management like described in other replies, I could see the Admin Account I was looking for - the account I was worried was missing along with all of my files.
The account was there but didn't show up on a restart to allow login.
What 'Solved' the problem for me was adding a password to the Standard User account which Windows 10 had opened after its installation and restarting the machine.
After the restart, the Windows 10 Start PAge appeared and I was allowed to log in to the formerly missing Admin Acct. The Win 10 installation routine went back showing Welcome to Windows 10 messages on the display and the system seemed to load all of the User Info for the account.
No problems since then.
BTW my Windows 10 install stopped at 99%, too like others. I removed a USB ReadyBoost Drive and USB eLicenseController fob.Windows 10 installation resumed.
Peace
MCP, MCTS, CompTIA SecurityPlus