I know this discussion is old but it is one of the top search results for this problem when I search for it. Just want to get the solution out there. We figured out how to work around this where I work so you can run the cc service as any user you want to and still get the watin tests to work. The solution is posted as an answer to this question on Stack Overflow: http://stackoverflow.com/questions/640273/watin-tests-fail-on-cc-net/1241329#1241329
Brett
