What's your question, exactly? Are you looking for a bluetooth adapter to buy? Or are you trying to get help connecting your phone?
If the latter, this should help: (no guarantees, since the guide was written for W98/ME...)http://www.wireless.att.com/support_static_files/KB/KB70877.html
In either case, I hope you'll realize that the speeds you get will be very slow for PC browsing.