I might have a solution for this
Go to Device Manager
Go to Bluetooth Radios (Make sure your bluetooth is on or else it won't show up
Right click on you bluetooth device (your might have a different name don't choose enumerator) and choose properties
then in the advanced tab give your bluetooth a proper (nick)name
Then click on the drivers tab, here choose update driver. make sure you have a internet connection up and the cd of the X1 in the drive. Let it automatically search for the latest driver. After finding it, it will display a balloon indicating it has installed software for PAN and more.
Turn on and start up the default bluetooth service from Windows
Add your phone to the list.
Make sure you started up your Internet Sharing option on the X1 and press connect.
Right click on the bluetooth icon in your taskbar, choose join a Personal Area Network.
You will be prompted with such a screen (I removed my personal name, but your will be shown here)
Click connect and your connection should be working
make sure ou have the beam option on your X1
(Sorry if I'm missing some steps for some, I was playing around and after the lasts steps I took I achieved a working PAN/BUN connection, so these steps are the only ones I remember correctly)