Running a Process from Custom Action

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C#

installer

Hi,
I need to open my program after it has been installed. I do this in the AfterInstall method. By starting a new process.

Process p = new Process();
                    p.StartInfo.FileName = "filepath";
                    p.Start();

The issue is that the program needs to get/set a value in the HKEY_CURRENT_USER registry but it is instead is looking in the HKEY_USERS registry. This is because the process starts under "NT AUTHORITY\SYSTEM". I have no of getting the users password so as far as I can tell I can't start the process as a different user. Everything works fine when the program is started normally, it's only an issue when opened by the Custom Action. Any idea's on how I can run it differently or get in to the correct registry?