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I have discovered today that apparently I can no longer do many seemingly unrelated tasks on my Windows 7 box because I get the following error:

WerFault.exe - Application Error
The exception Illegal Instruction

An attempt was made to execute an illegal instruction.

 (0xc000001d) occurred in the application at location 0xfc06cef0.

Click on OK to terminate the program
Click on CANCEL to debug the program
OK   Annuler   

I have no idea what happened, but I get this message when I try (among others):

  • Run System Restore
  • Uninstall an app

How do I troubleshoot this issue?

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Run hardware diagnostics (like memtest86+) first. Then sweep for malware. –  David Schwartz Sep 22 '13 at 2:25

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