My old desk top could notdownload itunes10 so i updated my iphone 4 on a new computer but i lost my music and my apps how can i recover them

my old desk top could not update my iphone 4 it could not download itunes 10 which was needed for the update. so i downloaded it on a new computer and i lost my music and my apps. how do i recover them?

look here how to back up:
http://support.apple.com/kb/HT1766

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