I used Windows 10.iso to upgrade from Windows 7 sp1 to Windows 10. I chose to keep all the apps and settings.

Upon finishing upgrading, I was confronted with a logon screen and a user name. Unfortunately, I could not log in. I'm sure I know the password but it just doesn't work.

Is that one the only account in Windows 10? How many accounts does upgrade keep? Is it possible to switch to another account at the logon screen so I can log in? How? Thanks.