How can I transfer my itunes account and library onto my new Sony PC?

I've authorised the new computer, I've tried downloading my music & podcasts from my iphone onto the new pc, but they seem to be there only as 'shadows'. I've re-subscribed to all my podcasts, but the new computer won't put them onto my iphone! Please help - I know I must be doing something... show more I've authorised the new computer, I've tried downloading my music & podcasts from my iphone onto the new pc, but they seem to be there only as 'shadows'. I've re-subscribed to all my podcasts, but the new computer won't put them onto my iphone! Please help - I know I must be doing something really stupid!!
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