If you already have "Client for Microsoft Networks" installed, then you need to do the following to fix your problem: Click on Start, then Shut Down. Now select the option that says "Restart Windows and log on as a new user" (or something to that affect). If asked for a user name and password when Windows restarts; put in your user ID for the user name but don't bother with a password. This is not talking about your password to get onto the Internet, rather a password to get into Windows. Don't put a password in; just say Ok. When prompted to confirm the password, say OK again. If you read the little tip message on the screen at this point you will see what I mean. DON'T SAY CANCEL TO THESE QUESTIONS. That will mess you up.
Now connect to Cybergap and you will notice the password option is available.