No, running Vista isn´t a problem, since I am using Vista myself.
You are running the 64-bits version of Vista I guess... Did you download the correct Visual #J, .NET and .XNA software (links are provided within the readme.txt file (campaign folder))? The 32-bit and 64-bits versions of Vista are using different versions of these three programs.
May I suggest that you visits the DMS site and asks the same question in this thread --->
http://www.digitalmindsoft.eu/forums...hp?f=15&t=2778 . We´ve a thread running regarding errors etc with DCG and our coder, Jason1, knows much more about the kind of problems you seems to have.
~Zeke.