When i attempt to start PRMAN (11.5.3) or any of its applications that run in a dos prompt (shaders.exe etc.) I get the classic applictation has encountered an error and will now close. I am running Windows XP with PRMAN 11.5.3, and have tried entering paramters at prompt (prman.exe file.rib) and double clicking them. As well as using pax rendus in 3d studio, which also comes up with the error shader.exe has encountered....