moved to new computer, sync ipod without delete
I've just upgraded my windows laptop. Got all my files and libraries moved to the new computer. However, now I want to sync my music with my ipod and it wants to ERASE everything (movies, music, tv shows) from my iPod before letting me sync. Is there any way I can sync without deleting everything? I've already uninstalled (and de-authorized) iTunes from my old computer.
HELP!
iPod touch, Windows 7