iTunes says it is unable to locate many of my songs, what do i do?

FromiTunes help:

Find iTunes files

By default, items you import into iTunes from CDs are stored here:

My Documents/My Music/iTunes

Depending on how you’veimporteditems into iTunes, your library might include items located elsewhere.

Important: For best results, don’t move the iTunes folder or folders inside it, and keep all your library files in one location.

Hide

Here are ways to locate your iTunes files:

• To find out where a file is stored, select the item in iTunes, and choose File > Get Info. The path to the file is shown at the bottom of the Summary pane (the Where section).
• To show the file in Windows Explorer, select the song, and choose File > Show in Explorer.

HideIf a song doesn’t appear in iTunes anymore:If you move song files, you might have to drag them to iTunes again to be able to play the songs. To set up iTunes to copy items you add to your library so that you can move the original files and still play them in iTunes, seeCopy files to your iTunes folder automatically.If you move songs out of the iTunes folder, you might have to add the songs to iTunes again before you can play them.If you throw away theiTunes Library file, your songs will no longer appear in your library even though the song files are still in the iTunes folder.If files have mysteriously disappeared, run a full scan of your computer with up-to-date anti-virus software.Here are ways to make your songs appear in the library again:

• Drag your iTunes folder (by default, located inside My Documents/My Music) to the iTunes window. You will see the songs in your library again. If the iTunes Library file was included, you’ll also see your original playlists.
• If that doesn’t work, your songs may be elsewhere on your hard disk. From the Start Menu, choose Search and search for a song by title or artist. Drag folders containing songs to iTunes to add the songs to iTunes again.If you don’t find songs by searching, check the Recycle Bin.