How do I get all my music back to my ipod now that I've updated it?

I had an original itunes account on my desktop. My desktop would not allow me to update my ipod on it so i updated it on my laptop. Now that i have done I no longer have any music and when i plug my ipod into my desktop it says that it does not recognize my ipod. What do i do now? How do i get my music back?

iOS: Device not recognized in iTunes for Windows
or
iOS: Device not recognized in iTunes for Mac OS X
You need iTunes 10.7 or later on the computer. If a Mac, you need OSX 10.6.8 or later and that requires and Tntel processor. However, you may be able to sync with iTunes 10.6.3 and OSX 10.5.8 but not restore
To get iTunes 10.6.3
iTunes 10.6.3

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