How can I run an EXE program from a Windows Service using C#?

This will never work at least not under Windows Vista or later. The key problem is that you're trying to execute this from within a Windows Service, rather than a standard Windows application. The code you've shown will work perfectly in a Windows Forms, WPF, or Console application, but it won't work at all in a Windows Service.

I think You are copying the . Exe to different location. This might be the problem I guess.

When you copy the exe, you are not copying its dependencies.

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