ITunes 9.0.1 could not be opened. Unknown error (-50) occured

Hello.
After upgrading to iTunes 9.0.1 the program stopped to work. Displays the above message every time I launch iTunes. Furthermore it changed its interface and alerts language back to english (system locale is ru_RU).
What does error -50 mean? How can I fix it?

http://www.iphoneatlas.com/
Look under recent posts.
Michael

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ITunes 9.0.1 could not be opened. Unknown error (-50) occured

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