When I open a pdf I get the following error

the exception unknown software exception (0xc0000409) occurred in the application at location 0x0041212b.

First thing I would try is 11.0.4 update.  If this does not resolve the problem, things you can try...

  • Using Windows Explorer navigate to C:\Program Adobe 11.0\Reader, and then double-click Eula.exe and accept the license agreement
  • You can open Adobe Reader by itself?  If so, try to disable the Protected Mode [Edit |] Preferences | (Improved) security].
  • If Reader opens in itself, try to disable the Safe_mode in the registry; Download, unzip, then run the attached registry script
  • It might even be a malware problem; See http://helpx.adobe.com/acrobat/kb/reader-core-dll-error.html

Post edited by: Pat Willener - path of file updated for Windows XP.

Tags: Acrobat

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