Problems with Process.Start

I am trying to run an exe from my .net 2 website but I cannot get
even simple code to work outside of Visual studio debug

very simple example (but my exe behaves the same)

Dim myprocess As New Process
myprocess.StartInfo.FileName = ("Notepad.exe")

myprocess.Start()


In debug this open up a new notepad window - good - that is what I
want

But , using a browser, notepad does not show up. It does start since I
can see it in the task manager.

This suggests insufficient permissions with ASPNET but the examples on
the web suggest that this simple code should work anyway.

Am I missing something here?
Do I need to delve into impersonation etc or is there something wrong
with my IIS setup?

Suggestions would be much appreciated

Thanks

Bill
.