If the phone doesn't have a USB cable and doesn't work with Nokia PC connect software, the best bet is to copy your contact to the SIM and find a USB SIM reader and move the data that way.
Alternatively you might borrow a friend's phone which does connect to a computer and, having backed all his details onto his SIM, put your SIM in and transfer to PC that way. Best done with a friend's old phone or they'll curse if they have to reset everything, ringtones etc when you return it.