How to sync iphone to a new pc?

How to sync iphone to a new pc?

Added (1). i've taken to buying a new pc, and now when i try to sync my iphone 4S to it so that it'd move on more songs to it, no tracks get copied.

The itunes library is the same as the old one except that i've added a few more songs on it, and when i start syncing it just gets to step 5 (preparing to copy) then it ends, and well nothing gets copied

Smart phones usually come with a built in 'companion' software which automatically boots up when you plug your phone into the PC, so try that. They have sync programmes in the companion software.