Here is our token trouble shooting guide from the FAQs. Please give this a try and let us know if you still have problems:
Try doing this from a command prompt on your primary:
telnet <i>ip_of_secondary</i> 30564
You'll need to have the telnet client installed on Windows Vista. To enable telnet for Windows Vista:
1. From the Start menu, click Control Panel.
2. Select Programs.
3. From the menu of the left, select Turn Windows Features On or Off.
4. Scroll down, and then check the "Telnet client" box.
5. Click OK.
Does this give you any kind of a response, or does it fail to connect? If you get the latter, it will be either because something is blocking communication over that port or because the Multiplicity service is not running on the secondary. For the most basic communication to occur, you will need the system tray icon (multipl.exe) running on the primary and the service (multisrv32.exe) running on the secondary. You will also need the system tray icon (multipl.exe) running on the secondary if you wish to have file sharing capabilities.
The services are accessible by going to Start->Run and typing services.msc
Look for the service named "Stardock Multiplicity"
-If the service is not started, start it.
-If you don't see the service in this list, run this file from within Internet explorer:
http://sd.stardock.com/mike/apps/reinstall_mpp_service.bat