pop quiz, indie kids!

Why won't my iTunes launch? megolas is our King.

I click on the icon, and I get the arrow cursor and then the arrow/hourglass cursor for a moment, and then just the arrow cursor while the computer thinks, and then the arrow/hourglass a little, and then just the arrow and it's all over and NO PROGRAM LAUNCHES? [ETA: !? interbang!]

( the enclosed is for archival purposes only! )