This situation occurs if when you went in through “Register” option, you accidentally entered spaces before or after your first or last name, or before or after your password in the password field.
To resolve this situation you have two options:
1) Log in typing your name and password exactly as you entered then during registration process. You may have to guess where you entered the spaces erroneously and duplicate this here.
2) Download the FixLogin.exe application using the link below. Running this program on the affected computer will correct for any spaces errantly entered before or after the first name, last name, or password, during the registration process. After running this application on the computer to which you installed the DTU application, you will be able to log in normally with the (leading/trailing space free) version of the user name and password under which you registered the product.