in reply to
Re^4: Trouble Installing Win32::GuiTest
in thread Trouble Installing Win32::GuiTest
dmake: Error code 255, while making 'test_dynamic'
Yes, that build worked fine. If you had closed all instances of notepad before doing that build you would most probably have found that the all tests passed and the build succeeded.
So ... try doing the same thing again, but this time close all instances of notepad first. (Opened notepads cause trouble for the Win32-GuiTest suite - which is why it bails out if it detects that notepad is already opened.)