Hi Billy--I hope someone who knows iTunes can help, but in the meantime, you could duplicate your itunes Music folder. Option-drag it to the desktop if you have the room, or duplicate it (Finder > File > Duplicate; cmd-D). At least you'll have a backup, but that shouldn't be necessary.

Restart or if using OS 10.2, restart in safe boot (hold down the shift key right after the start-up chime). This will do a file structure check (fsck) and fix simple problems. With luck, this is all that you'll need to do before restarting normally.

What OS are you using?