System Exception in Process.start()?

I am getting a sstem Exception while executing the below lines of code.

Process objProcess = Process.Start(objProcessStartInfo);
//objProcess.WaitForExit();

Background: I am trying to execute a batch file in an upgrade installer (Custom Actions).

The above piece of code work开发者_高级运维s fine in both Windows XP and Windows 7 in a sample application. however the same code inside upgrader works fine in WindowsXP - Eng & Jap, Windows 7 - Jap....but where as it is not working in Windows 7 Eng. The Process.start() method returns FALSE.

Thanks in advance

Since you're describing many different environments, the most likely explanation is that in the failing environment, the program you're trying to start isn't being found. It could just be a path issue, or the program or something it depends on isn't installed. Can you start the program in some other way on the machine where your code is failing?