Adobe Reader 10.0 is installed in a protected mode. One of the features of the secure mode is:
The solution is to disable protected mode by completing the following steps:
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Within Adobe Reader, go to Edit > Preferences > General and deselect Enable Protected Mode at startup.
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Restart Reader.
For more information, refer to the following Adobe KB article: http://kb2.adobe.com/cps/860/cpsid_86063.html