Hello Damian,
You may very well want to take a look at migrating your iTunes library from one PC to another by click or tapping here.
If you want to do it over again making sure you ripped the audio CD’s with the best audio quality take a look here on how to use Windows media player to automatically rip the CD or here for iTunes. Be sure to check that import disk content automatically box.
Hope that helps, additionally be sure the CD-ROM drive you are using has at least 24x read speed for CD-R to ensure you are getting the job done efficiently.