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Quicktime blocked by Windows DEP after Vista Service Pack

17 years old. Gear and prices may have changed since.

What the thread found

  • Data Execution Prevention in Windows Vista can prevent Quicktime from running after a Service Pack update
  • Adding an exception for Quicktime through System Properties (sysdm.cpl > Advanced > Performance > Data Execution Prevention > Add) may resolve the blocking, though success is not guaranteed

Depends on

  • The workaround did not work for the original poster despite following instructions correctly
  • Problem appears specific to Vista with a particular Service Pack version
  • Unclear whether the issue stems from Microsoft or Apple implementation
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