EVO7, thanks for that. Couldn't see anything as you describe on Aotoexec.bat, but I wasn't sure where exactly I should have been looking. The message on shutdown reads, more precisely. 'R6009 runtime error.......not enough space for environment' and only appeared after loading some fairly hefty games. I have plenty of memory etc. The message still appeared after I uninstalled all games etc.
Any further thoughts?
Cheers
mcdhu