the easiest way i found to tether is this.
1.) in activesync, go to connection settings, uncheck the box that says allow usb connections.
2.) connect your phone, go to comm manager, turn on internet sharing
3.) connect and enjoy!!
this way there is no need to open pie first. it works even when no connections has been established on the phone first. it is important to not have an activesync connection on your computer as this will make your connection cut out every few minutes.