Welcome screen shows only 1 user

[Guest]

I have 2 users, both administrator accts, but only my picture & name show up
on welcome screen, and can't see the second user on the welcome screen or
when trying to change user (Windows Vista).

 

[Michael]

At a command prompt type

net users

to get a list of accounts that Vista knows about.
The Administrator account is not 'yours' it is the systems so you cannot
normally login on that one and it doesn't show in the welcome screen.

Then do net users 'name of account' for your two users and check for
differences in their capabilities. That may provide some clue.

Michael
Vista home premium