I have a new HP computer and would like to transfer my iTunes library from my old PC

I have been trying to transfer my iTunes library from my old PC to our new HP PC (Windows 8.1). We did back up our old PC files to an external harddrive but the iTunes files are 'jumbled'when I open them on the new PC and not in any format - only streams of titles etc., Is there a simple way to transfer my library to the new PC. My iPod has my library on it - can I syn from iPod to PC? Thankyou for any suggestions/help I can get.