In this tutorial, learn how to delete Itunes library on PC.
Your Apple iTunes playlists are messy, so you wish to start over with a new Itunes library. This tutorial will show you the best way to clear Itunes library.
Note: This method will clear everything in iTunes to a default state. The playlists, library, and apps lists will be cleared out. Music files should still be preserved on your computer.
Windows 10: C:\Users\YourUserName\Music\iTunes\
Windows 8: C:\Users\YourUserName\My Music\iTunes\
Windows 7: C:\Users\YourUserName\My Music\iTunes\
Windows XP: C:\Documents and Settings\YourUserName\My Documents\My Music\iTunes\
Step 3. Find the iTunes Library.itl file, then rename it to iTunes Library.old.Do the same thing for the iTunes Music Library.xml file
Hope something helps you.