Adobe Acrobat DEP error

Solutions

Disable DEP on the operating system.

Windows 7

Choose Start > Programs > Accessories.
In the Accessories menu, right-click Command Prompt.
Select Run As Administrator.
If you are prompted to do so, enter you administrator credentials.
In the Command Prompt window, type bcdedit.exe /set {current} nx AlwaysOff.
Click Enter.
Close the command prompt.
Restart your computer.

Windows XP

Right-click My Computer and choose Properties.
Choose the Advanced tab.
Choose Startup And Recovery > Settings.
Choose System Startup > Edit.
Find the text that says /noexecute=OptIn and replace OptIn (the default) with AlwaysOff.
Restart your computer.

Disable DEP for Acrobat or Adobe Reader on XP

Note: This solution only works on Windows XP

Open the registry.
Navigate to HKLM\Software\Adobe\Adobe Acrobat\10.0\.
If the Security hive does not exist, right-click and choose New Key.
Create a hive called Security.
Choose Security and right-click in the right window.
Choose New  > Binary value.
Create a key called DEP and set its value to 0.
Exit the registry editor and restart Acrobat.








source: http://helpx.adobe.com/acrobat/kb/dep-error-using-acrobat-reader.html