XP Embedded attempts to start application as service

I'm having a lot of problems trying to start an application as administrator on an application I'm writing when running it on XP Embedded.

The application runs as the shell for a limited user account and is touch-screen and keyboard-less with one user command being to run the touch screen vendor's calibration tool. This must be run as administrator.

No problem I thought, add user and password information to the ProcessStartInfo and开发者_运维技巧 all should be fine. No. The error I get is:

System.ComponentMode.Win32Exception: The specified service does not exist as an installed service.

From some investigation, I've found that:

• My Process starting code is correct:
  • any application can be started successfully on XP Embedded when run as the limited user
  • any application can be run as Administrator on my own laptop
• on XP Embedded, any application is regarded as being a service in the same way, including notepad
• if I attempt to start a program from within process explorer, I simply get "Unable to execute process: Access is Denied"

I'm not an XP Embedded expert in anyways so I'd very much appreciate some help. I suspect that there's a configuration setting that has been set when building the XP image that specifically denies access to process creation and that the errors I'm being reported are actually mis-reports from software that's not assuming XP Embedded error codes.

Unfortunately, the people who make the base image aren't around right now so I can't get the current settings.

Thanks in advance if anyone's ever seen this before!

Kev

For the record, it turned out that the "Secondary Logon" service wasn't installed in the image.

The code I had reached down eventually into either CreateProcessWithLogonW or CreateProcessAsUser which ultimately depend on this service running. The "specified service" error was spot on, but not about what I thought it was about. No idea why I got that particular error from Process Explorer.