I cannot open files with Adobe Reader XI on my windows 7

Please help. I am not able to open or attach PDF files on my windows 7 machine

Any changes to your computer since the new behavior started? You can try to uninstall Reader and re-install to see if that helps. You can run the cleaner tool after you uninstall to make sure you are starting with a clean slate:
http://labs.adobe.com/downloads/acrobatcleaner.html

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