Run .exe from TeamCity

I realize this has been beaten to death.  For the life of me I can't figure it out.  I have a simple test that needs to call an executable.  I'm programming in C# and just creating a process to open a simple .exe.

Here is everything I have tried:

- Running TeamCity from console (agent.bat start, added task scheduler with full rights)

- Created a user that auto logs in, no screensaver, no locking

- Used tightvnc with no login

- Used the computer that the agent is installed on (no rdp or vnc)

I'm using an xUnit.net build step.... its calling xunit.console.runner in powershell (I think, I can't figure out where to see exactly the command its calling)

The test runs fine manually through command line...but will not open the GUI in teamcity.  I've gotten around the session 0 (interactive session) by doing the above, but can't figure out what to try next to get the .exe to open.

Any advice is appreciated.