I got round the problem by doing a system restore back a couple of weeks and it's playing everything ok at the moment.

When I followed the links in John in Ks post IE browser is an older version but the Google browser has been updated. However, after going to the Adobe site and trying to download the latest version manually, the same thing happened, and it refuses to download and leaves the page.

I think I'll just stick to the Google browser for now.

Thanks anyway!