Acrobat X and Encrypted PDFs

Hello -
We have Acrobat X (10.0.3) Pro (the version you can create PDFs with) and are having trouble with at least one machine.
There is an encrypted PDF that will cause Acrobat to give an error. (encrypted meaning, cannot edit/change the document)
There is no password to open and use it.
When opening the document we get:
Adobe Acrobat has stopped working
A problem caused the pgoram to stop working correctly. Please close the program.
Other PDF's work, if you open a PDF and go to Tools (upper right) then Protection and Encrypt. All the options are grayed out. Is there a way to "install" encryption options?
I have removed Acrobat X, rebooted, reinstalled, reboot. Still isn't working. On machines that can open this document, then do have Encryption options.
Thanks, Nick

Anyone have a thought on this, as to what's missing causing Acrobat X to not work with Encrypted PDF's? or be able to encrypt any of it's own?

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