Adobe X, Windows 7 and protected mode

Hi
Adobe recently installed an update for Adobe Reader X, and now it won't open in the protected mode due to a problem with the system configuration (I'm running Windows 7).  Attempts to find out what's wrong won't open, and if I select "protected mode disabled" it tries and then tells me "failed to load Core DLL" and gives up.
Does anyone know what configuration setting I need to change, and how, to make it open?
Thanks!

Try the Reader forum. There is no product Adobe X, but there is Reader X and Acrobat X. This forum is for the latter.

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