Reply to Lost some iTunes metadata when moving library to a new computer

Sorry for all the threads, but nobody answered this question and I couldn't find one online so I figured it deserved it's own thread.

I recently moved my iTunes library from one laptop to another, and noticed that I lost some of the artists names, genres, etc that I spent so much time inputting. I have iTunes set to "organize library" and update all the ID3 tags to the most recent, but once I initiated iTunes in the new computer it told me that some of my tracks were missing. On further investigation it seemed that well over 100 of them lost the metadata and are listed as "track 1" or just have the incorrect genre, name or artist.

This has happened pretty much everytime I've switched computers but I never cared that much because I just put in the time to do it over again, but recently I've had to switch machines more than ever and I'm wondering if there's a way to make the transfer of an entire library and the associated metadata more seamless.