Assuming you have adminstrator rights:
1. Right click on MY COMPUTER, choose Manage,
2. Action, Connect to another computer, input the remote PC name, ok,
3. click on Services and Applications, Services, locate Messenger, right click, choose Properties, Change start up to Automatic, click on Start.
Exit Computer Management to disconnect from the remote PC.
Do the same thing again on your own PC, just skip step 2.