BT Syn in one PC with 6600 & P900

I'm currerently using a Mitsumi Bluetooth on my PC, i follow the instrution here:
http://www.allaboutsymbian.com/forum/showthread.php?s=&postid=146716#post146716
It works for 2 mins, while it's backuping, XP give me blue screen.
After that, it never work again, so i install P900 Suite and it connect to the BT serial port, it work with SEP900 Suite, but everytime when i try to connect BT serial with my 6600, it can't detect it's paired, but not connected.
Can anyone here help me out with it?