Power went out when iTunes update to 10.5.1 was installing.  Now it's incomplete and I can't download tunes. What ca I do?

Power went out when iTunes update to my computer was installing. Now it says: "A required iTunes component is not installed.  Please repair or reinstall iTunes (-42404)".  I hit "check for Updates and it shows I have what's current.  How can I fix this without losing all my songs?

In case you're running Windows, did you check your security software settings? iTunes for Windows: Troubleshooting security software issues
iTunes has to contact Apple during the process of downloading and updating iOS software.

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