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Information on Flash "kill-bit"

Sep 27, 2011 11:55 AM

Tags: #flash #install #windows #player #virus #faq #kill-bit

Information on Flash-Killer or "kill-bit"


Microsoft has a method to easily disable certain ActiveX controls, using a "kill-bit".  It is documented at


The "kill-bit" for Flash Player is documented in



What does that mean?


Flash  Player may not be working on Internet Explorer, and the 'Shockwave  Flash Object' add-on may not show up at all.  Most likely because the FP  ActiveX has been "kill-bited" by some anti-malware app.



How to check and remove the "kill-bit"?

WARNING!   Fiddling with the Windows Registry may render Windows or installed  components unusable.  Always make a registry backup or a System Restore  Point before attempting to manually change anything in the registry!


  • open the registry editor: Start | Run | type regedit.exe
  • navigate to this registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{D27CDB6E-AE6D-11CF-96B8-444553540000}
  • if that key does not exist, then the "kill-bit" for Flash Player is not set
  • if it contains a DWORD entry with the name Compatibility Flags that has any value other than 0x00000000, then the "kill-bit" for Flash Player may be set
  • to remove the "kill-bit" do any of the following
    • change the value from 0x00000400 to 0x00000000 (right-click | Modify | change value data to 0)
    • or  delete the registry key (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet  Explorer\ActiveX Compatibility\{D27CDB6E-AE6D-11CF-96B8-444553540000})  completely
  • close the registry editor when done

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