There is another way to get the password that is probably easier than doing the WinHex method described in that link.
The short version of the story is that the radio and computer use TCP/IP over the USB connection to communicate. The password is sent to the computer in plain text with periods in between each letter (so if your password is "spongebob" it would be sent as "s.p.o.n.g.e.b.o.b"). If you're familiar with packet sniffing, just look at the traffic between the radio and computer when you try to read it. If you're not familiar, it's not hard. Just download Wireshark (http://www.wireshark.org/
) and install it. Make sure your radio is plugged in and powered up, and start Wireshark. You should see an interface available for monitoring that has something about Motorola in its name; that's your radio. Switch over to CPS and read the radio. When the password prompt comes up, leave it there and switch back to wireshark. Start looking through the packets for the password (start with the most recent one, since the password should be one of the last things sent to the computer).