Windows 7: Admin logon but not interfere with auto login?

I need to have a login name with a password and admin permissions but don't want to disturb the usual user by forcing a choice of logins where before her PC just opened for her automatically.

I do a bit of support for some U3A folk and want to install Teamviewer on some of their machines to do remote support. To be validated across the network or Internet, I need to have a passworded login and don't want to use their login names (many without passwords!) but only one of my choice or preferably the 'hidden' Administrator account (best for full access).

Is it possible to have access to Administrator (I know how to enable it) and not spread confusion by having it plastered on the login screen?

My current networked PC is not Windows 7, alas, so I can't experiment before going to their home.

You can still tell Windows to automatically log in using a specific account even though there are multiple accounts in the system.

Start > type "userpasswords2" in the search bar.

Uncheck "Users must enter a username..... blah blah". Hit Apply.

It will ask for a username/password that it should automatically log in with.

Continue to set up user names as needed or BETTER YET, set up all the usernames you want THEN do this.