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I tried some of the other discs he did for me and hey presto, they worked. So perhaps it was just the first one I picked that he hadn't "finalised". Next question, even though I have iTunes open on my laptop, the dics opens up and plays through something else, Windows Media Player I'm assuming (a little box pops up with the play symbol etc). Does this mean I won't be able to copy anything into my iTunes library (which was the point of him doing the discs for me)?!