I think the fact that no-one has replied about your Cubase SX posts is that it sounds like you are having very strange problems.. we're not just all being rude
All I can suggest is make sure you have the latest drivers, test your midi output with some other program (is it just Cubase that does this?) and recheck your midi rx/tx settings on your virus, and again in cubase.
Otherwise, sorry I can't be of any specific help
