Make sure that all your computer and your OSX is updated too.
Highly recommend that you read this:
Another must read too.
Be prepared, because FCPX handles media much differently.
Lastly I would recommend you watch Mark Spencer and the great team at Pixel Corps on YouTube
Yes, I have tried that Tom, is hasn't worked, I have changed my password since - maybe thats an issue? I have stored up all my other data upgraded to Mavericks etc but I can't see anywhere in the App Store where you can even upgrade to 10.1.1? Strange, I think I'll need to go to the apple store...thanks for both trying to help!