Hi,
This almost look like a network driver problem. What happens is, if Ghost DOS client finds that the network driver is not installed, it reboots the machine to avoid it getting stuck in DOS (If the network driver is not working, once boot in to DOS, Console cannot send any commands to the client). From Console point of view, it only knows that it ask the client to boot to VP but it did not contacted the Console from VP - so go to VP fails.
What is the network card you have in the machine, and what is the template you use?
When you run the task, it should boot to DOS and then reboot to Windows. When booting to DOS do you see any error messages? If you press F8 at the 'Starting PCDOS' prompt, it will allow you to go through the commands step by step.
Krish