http://windows.microsoft.com/en-US/windows-vista/Windows-Update-error-8007f205
I suggest rebooting first (a clean restart) to let any pending updates
complete, then re-try the installation above.
WMP updates would normally come via windows update, it's worth
enabling that or going to the site using IE browser and choose Express
Install at http://www.microsoft.com/windowsupdate
HTH
Cheers - Neil
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Digital Media MVP : 2004-2010
http://mvp.support.microsoft.com/mvpfaqs