Can't get a silent install!

This seems to do the trick.

Thanks for the help.

You can be one of the first to use the steps we'll be adding to the Flash Player emerging issues technote early next week. The text isn't final but the steps should work for you:

Issue
Licensed users of the Flash Player Distribution License (www.macromedia.com/licensing) reveive an MSI installer which can be used for distributed installs of Flash Player. In certain circumstances the Flash Player 9 MSI may have the following issues:

When you run the Flash Player 9 MSI silently using the /quiet switch, the uninstaller built into the MSI to remove previous Flash Players fails to be silent and prompts an "uninstallation complete" dialog.
If the Flash Player folder at C:\Windows\System32\Macromed\Flash contains a FlashPlayerTrust folder with config (CFG) files that folder will be removed. Placing config files in this location is a technique used to allow all users on the machine access to local CD drives and other Flash Player settings (see "Security Changes in Flash Player 8" http://www.adobe.com/devnet/flash/articles/fplayer8_security.html for more information.)
NOTE: The above will only occur if the file "Flash8a.ocx" is present and was installed by the Flash Player 8 MSI installer. Flash8a.ocx is the Flash Player ActiveX control version 8,0,24,0 from April 2006. If Flash8a.ocx was never installed by MSI on that machine then these issues should not occur. The machine may also have Flash8b.ocx, which is a refreshed version of Flash Player ActiveX control version 8,0,24,0. Machines with only Flash8b.ocx should not show these issues.

NOTE: This issue should not effect end users who installed Flash Player 8 or 9 from the internet. Only machines with Flash Player 8, installed by the MSI installers should observe this issue.

Solution

Use the Microsoft Windows Installer Cleanup Utility (technote: http://support.microsoft.com/?scid=kb;en-us;290301 to resolve the silent uninstall issue and the removal of FlashPlayerTrust issue.

However, this introduces a new issue. After running the msizapp.exe portion of Microsoft Windows Installer Cleanup Utility, the file "Flash8.ocx" remains in the folder in a locked state.

To resolve all of the above, modify your Flash Player MSI distribution to use the following multiple steps, in this order:

Run Msizap.exe T {5E8A1B08-0FBD-4543-9646-F2C2D0D05750}. This will remove the damaged registry items causing the initial silent install and FlashPlayerTrust failures.
Next run either Flash Player Uninstaller OR the Flash Player Admin uninstaller described in " Installation issues with Flash Player 7.0.63.0 or 8.0.24.0 and later" ( http://www.adobe.com/go/4da116d3).

The Flash Player Uninstaller v3.0.0.19 can be downloaded from "How to uninstall the Adobe Flash Player plug-in and ActiveX control" ( http://www.adobe.com/go/tn_14157).

Uninstfl.exe is included with previously successful Flash installs. To unlock and delete flash8a.ocx run it with -q as follows:
Uninstfl.exe –q flash8a.ocx

Either of these uninstalls should successfully remove Flash8a.ocx.
Finally run Flash Player 9 MSI with /quiet. This should run silently and not effect FlashPlayerTrust.

Bentley Wolfe
Senior Support Engineer, Flash/Flash Player
Adobe