I cannot open itunes on my mac.  The Icon jumps, but nothing else happens.

I may have shut my computer off while a new version of Itunes was downloading.  Not sure if this would affect it, but I can't open it now.  When I click on the icon, it jumps a little, but nothing else happens! Any ideas?? Help! I can still open it on my iphone. 

Boot from your Snow Leopard install DVD, run Disk Utility and run Disk First Aid.
Reboot.
Then Apple menu > Software Update.
Then reinstall iTunes.

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