How do I restore itunes library onto another computer
I'm just echoing the Apple KB article for anyone else who comes across this answer. I have used this process many times when moving or reformatting my computer:



Process for restoring an iTunes library:


Quit iTunes.
Copy your iTunes folder from your external hard drive to whatever location you desire on your internal hard drive.
Open iTunes while holding down the Option key (Mac) or Shift key (Windows).
In the resulting dialog, click the Choose Library button.

Navigate to the new iTunes folder you just copied and locate the iTunes Library.itl file
Click Choose (Mac OS X) or Open (Windows)
iTunes will open and your iTunes Library will be restored.