Itunes Gracenote Database Cannot Connect Itunes To Any Internet, E.g Itunes Store, Gracenote Database, Updates Etc Etc. Please Help!?

Cannot connect itunes to any internet, e.g itunes store, gracenote database, updates etc etc. please help!? - itunes gracenote database

Hello, in the last two days I have not been able to connect to iTunes version 8.1 on Windows XP, I think everyone on the Internet through options such as upgrades, storage, Gracenote's database, or use the network via iTunes!. My friend just used the new iPod nano on my iTunes and I wonder whether that complicated things? I have tried everything Firewall Plus, what he said on the Apple site, but no luck! any help would be very grateful !!!!!????