From your PC ..........
with device cradled
click on Start, Control Panel
Double-click on System
Click on Hardware, then Device Manager
Click on '+' to left of Universal Serial Bus Controllers (Portable Devices in VISTA)
Click on '+' to left of Windows CE USB Devices in XP
Right Click on device
Select 'Uninstall'
Uncradle device
Reboot PC
Now run WMDC, and do not connect the phone until it asks you to.
Laura