Have you made sure that you have got the Chevron Certificate on your device?
Have you made sure that you have made a partnership with your device and Zune and that Zune is running?
Have you made sure that the time and date and your device is correct?
Have you made sure that your phone is unlocked?
Once you done all that guys then run Chevron Unlocker from the root of your C drive, making sure that you right click on it and run as administrator. You should be able to unlock and then use M$ application deployer to deploy TouchXplorer.
You could also try installing one of the custom ROMs as these are all unlocked and you can sideload apps without the need to unlock.