Windows DEP won't let Adobe run

Tried making adobe reader an exception in control panel DEP, windows won't allow it.  Tried repairing adobe reader in control panel.  Tried un-installing and re-installing adobe, still no good.  Tried re-starting pc, shutting down and re-starting.  Don't know what else to try.  Have lots of files saved as pdf, can't open them.  Can't access files on internet in adbe pdf.  Anyone have any suggestions?

When I try to open a pdf file on my PC either from my saved files or from a website Windows immediately shuts down adobe and the file does not open.  I then get a pop-up message stating that Windows "Data Execution Prevention" has prevented the programme from running to protect the computer from a programme not using memory correctly.  The steps to prevent this happening are outlined as: Go to DEP in control panel and make the programme (Adobe Reader) an exception from control.  Tried that, Windows said it wasn't allowing it.
Tried un-installing and re-installing Reader in case it had become corrupted still no joy.

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