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Installation of Flash failed because of insufficient permission for a required file. Could you please tell me how do correct this?


I receved an installation error saying that there was a required file, which could not be written 'due to insufficient permissions.' I clicked on the Troubleshoot for Flash, but could not figure out how to find the file (C:\Windows/system32\Macromed\Flash\NPSWF32.dll:5) .

Additional System Details

Installed Plug-ins

  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Adobe PDF Plug-In For Firefox and Netscape 10.0.1
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Default Plug-in
  • iTunes Detector Plug-in
  • Picasa plugin
  • Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
  • 4.0.60129.0
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • RealArcade_NPAPI_Plugin


  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv: Gecko/20110303 Firefox/3.6.15

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  • Top 10 Contributor
  • Moderator
10747 solutions 96719 answers

Run the plugin installer as Administrator by starting the installer via the right-click context menu (Run as Administrator) to get elevated permissions.


Question owner

Thank you very much co-rel. It's so frustrating when things like this happen. I appreciate your help, wriglysyl.