default for Acrobat

[Microsoft Windows]

I have Acrobat X Pro installed, and have set it as the default app for .pdf files. When I click on a pdf file, however, I am always prompted to choose the app to open the file, and the list of apps has Acrobat X at the top, but the button at the bottom of the dialog is "Just Once". Clicking on it does properly open the file in Acrobat X Pro, but I don't understand why the system will not honor my choice of it a the default app and automatically open the pdf file using it. How I make the system actually set Acrobat X Pro as the app to automatically open .pdf files?

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