If you landed on this page without visiting the original article, please see it here.
I understand that many computers are crashing when iTunes begins Determining Gapless Playback for a large number of songs (especially when those songs are stored on a network drive). Here is one more thing that you should make sure that you do prior to trying the steps specified on the previous page. In the image below (the iTunes Information Window), note the X on the right side of the window.
While iTunes is Determining Gapless Playback Information, make sure to stop it by pressing this X before you try the steps on page 1 of this post. Note: Only press the X once and give it time to stop… give it a couple minutes if necessary. I had over 3,500 songs on a network storage device and I believe it took my computer about 2-3 minutes before iTunes actually became functional again. So be patient, wait it out, and then try the steps noted on the previous page.
Check the update on Page 3 of this post if you have recently upgraded your version of iTunes.
See this post: Disabling iTunes Determining Gapless Playback