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ISSUE 

Flash Player may fail to install due to incorrect permissions in the registry. Before you download the Microsoft tool and follow these instructions, first read this TechNote "Troubleshoot Adobe Flash Player installation for Windows" (TechNotetn_19166).

Additionally, if you don't have administrator access, then you may not be able to install Flash Player successfully. Permissions can be tricky but, in general, you should be able to install and use Adobe Flash Player if your system administrator gives you full access. Windows administrators should be familiar with "Registry permissions required for Flash Player install or update" (TechNote tn_19148). 

REASON 

Flash Player and other programs may fail to install if there are incorrect permissions in the registry or if there are missing ACLs for the Administrators group or for the built-in System account. The Windows Installer service runs with System account permissions. The installation will fail if the System account does not have sufficient permissions to access the file system or parts of the registry.

SOLUTION 

Using the SubInAcL tool from Microsoft to fix permission issues in the registry has solved installation errors for several products including Flash Player.

Warning! The following solution involves the Windows System Registry. Editing or manipulating the registry incorrectly can result in serious system damage which may require reinstallation of the operating system. If you are not comfortable editing the registry, then take your system to a professional. If you choose to proceed, then it is essential that you create a complete system backup and a Windows System Restore Point before proceeding. Adobe Systems cannot be held responsible for damage resulting from this information.

You must have administrator privileges to successfully complete these instructions.

1. Follow the instructions to download the SubInACL tool from the Microsoft Download Center.
2. Install SubInACL.
3. Download the reset_fp10.zip file.
4. Extract the reset_fp10.cmd file to C:\Program Files\Windows Resource Kits\Tools\. 
   
   Important: Be sure that both the subinacl.exe and reset_fp10.cmd files are in the same location here: C:\Program Files\Windows Resource Kits\Tools\. 
5. Double-click reset_fp10.cmd.
6. This will open a command window and execute the SubInACL tool.
7. Do not use the machine while SubInACL is running.
8. When it is finished you will see "Press any key to continue".
9. Install the Flash Player from www.adobe.com/go/getflashplayer.