Wubi sets your Account Name to the Windows Account you installed under, regardless of the username you choose. But under the covers, it is using the username.
So, you choose
jim as your username, but install from your Windows
Administrator account. This means your home directory will be
/home/jim and your username
jim and your Terminal prompt
jim@ubuntu, but on the account login you will be prompted with
Administrator. You can change this if you like by going to User Accounts Settings.
The reason for this weird behaviour is that the designer expected you would install under the account
Jim and then automatically defaulted the username to
jim. However, the designer didn't code for the case where the account was
Bob and you installed as
But note that the password is always the one entered when you installed Wubi. Make sure you use the one you had to enter twice, regardless of the account name you're greeted with.
Note: when you enter a password in the terminal, it automatically suppresses output for security purposes. It doesn't show any response (e.g. not even
*'s). You just have to type it and hit Enter. Read this question for more info: Nothing shows up in the terminal when I type my password.