Thanks for all the help - I told my son about what we'd discussed here and he abandoned the Moviebox - interestingly he managed to get some drivers and now his Easycap works again, (wish he'd done that before I forked out all that dosh on what is effectively a wet fish), Although he tells me the Easycap lags a lot so he may be buying an NTSC Xbox for his capturing!

UPDATE - Fixed the lag by setting priority to high in Task Manager - My son can play while capturing on the PC now!