Upgraded from X to XI but now cannot open PDF.

Have upgraded per email notification from X to XI but now cannot open PDF.  Opens with Adobe screen with blank grey background for about 3 seconds then disappears.  Uninstalled both macafee (accidentally installed at same time) and XI, reinstalled as X (without macafee) which was fine prior to XI installation but still same result.  Using windows 7 and Norton protection on Toshiba QOSMIO laptrop about 9 months old.  Not technically savvy on computers,  Any help please?
sir warwick  

Things to try...
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)].
It could even be a malware issue; see http://helpx.adobe.com/acrobat/kb/reader-core-dll-error.html

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