Windows Mobile Device Center Not Starting or Connecting to AT870
Follow the following link for instructions
The following are instructions on the issue.
The easy solution is to run the following EXE file which will make the registry changes stated in the pdf above.
Restart your machine after making the Windows Registry changes.
Disclaimer: Execute the above .exe only if you understand how Windows Registry works. Making changes to your windows registry system can make your Windows operating system unusable.