this should help you as well
http://forum.xda-developers.com/showthread.php?t=524619
I just popped my tp2 into boot loader and plugged it into win7. It came up as qualcomm blah blah blah with a bad driver.
I then went to device manager, right clicked the device>properties>update driver>search automatically....
It downloaded the drivers and updated the name of the device to HTC USB Sync.
Though this may help, I think the real problem is that the phone is never getting to the point where it will accept the connection from the the unlocker software.