Thank you ajuma and Arnie The problem is we have a very temperamental PC. We call it 'Ozzy' after Ozzy Osbourne. Moody, irritable, swears a lot but darn good at what he does!

Turns out he just doesn't like the anti virus programme running at the same time, so If I exit or use game mode he's fine with it, so I now have my family back and I am ecstatic once again.

Thanks again for your help! Much appreciated.