Other problem is with the AVG free version - I updated it, had to restart - that seems right, I checked on the AVG site. And the 'User Interface" said that everything was working.
Then the icon at the bottom of my screen got the exclamation mark that means it's not all working, then got a message saying 'connection to the update manager failed' - and user interface shows that as well.
Have I recieved a corrupted update again? AVG isn't what it was since MS got involved.

Edit - CANCEL THAT!
Just done it again (about the 10th time) and it worked. Must be too many peeps trying to update - I did jusat get one of those half genuine, half hoax (according to Snopes) virus warning so maybe it sent people updating like mad!
Still wondering about the Player Core thing tho.