You are at the Login Screen. To log in, enter a username in the "User Name" field, and click "OK", or press Enter. If you have logged in before, you can select your name from the popup menu below the "User Name" field, and it will automatically enter it into the "User Name" field. There is a limit of 12 usernames per computer.
After you log in, Settings and Test Results will be saved for your username, so the next time you log into the Rosetta Stone, your Settings will be restored.