Reader will not open pdf

I have tried re-installing  and repairing reader X and XI but nothing is working. All that happens is that the program starts then closes, I can't see any document open. I have been able to see pdfs on my browser so it seems like a problem with the program. I am a student and need this for all of my classes so any suggestions would be great. running windows 7

P.S. if the 11.0.4 update does not fix it, here are some workarounds...
Using Windows Explorer navigate to C:\Program Files (x86)\Adobe\Reader 11.0\Reader, then double-click on Eula.exe and accept the license agreement
Can you open Adobe Reader by itself?  If so, try disabling Protected Mode [Edit | Preferences | Security (Enhanced)].
If you cannot open Reader by itself, try to disable Protected Mode in the registry; download, unzip, then run the attached registry script
It could even be a malware issue; see http://helpx.adobe.com/acrobat/kb/reader-core-dll-error.html

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