I just had to let out some steam! I’ve just spent about two hours trying to install, remove, reinstall, remove, install once more, then think I have working a TV card, until finally I nearly had the computer not boot up at all. It all drives me totally mad.
Just to explain that my computer has been away having a totally shot motherboard replaced, and for whatever reason, it looked like it was happening again.
Now, of course, I have a (seemingly) working system with no TV capture card. Better the devil you know.