Cant watch HD content after update to iTunes 9

I've a lot of HD downloaded from iTunes store, after I upgraded to iTunes 9 it just displays a gray window, with no sound.
Any suggestions?

Quicktime itselve says, that it cannot read this filetype.
Hmmm. Launch your QuickTime Player. Now go "Edit > Preferences > QuickTime preferences." Click the file types tab.
Expand "MPEG - MPEG System, video and audio files".
Are "MPEG Media" and "MPEG-4 Media" both currently checked? If not, check them and click okay. Does QuickTime now play the file?

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