After 10 months from purchase I've had a bit of a result with this game and the fatal error message.
I was not having much luck with the Atari support site, then a couple of months ago I received an email from Atari US which asked me to send my copy to them for a replacement.
I thought it was a bit risky sending it all the way over the pond so just gave up.
However yesterday while walking down the road I did a google search on my mobile for Atari uk to see if there was a phone number.
I found a number so I thought I'd give it a try to see what happens. It went through to Namco Bandi which i was passed through to a guy that was very helpful and said that there were some dodgy Wii discs on release, but unfortunately the game is rather rare these days so he took my name, address and tel number.
I've come home from work today to find waiting for me in a brown packet a brand new sealed copy of Ghostbusters with an accompanying note saying Happy Ghostbusting kind Regards Namco Bandi.
I've checked it out and it works fine with no fatal error message.
I'm rather impressed that 10 months after purchase they have sent me a new copy for nothing and not even want the old one back as proof that I've actually got the game in the first place.