I am having a rather difficult time creating a rather simple install script for the latest Flash MIS files. It seems that I can run each of the files manually and click my way through the install without any trouble. If I attempt to run the MSI files via a batch file, both MSIs throw Windows Installer Error 1619:

"This installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer package."

Here is my script (names have been changed to protect the innocent):

@echo off
SETLOCAL
SET DEPOTDIR=\\server\share\Adobe\Flash Player 10.0.12.36

:inst1001236
echo Installing Adobe Flash player v10.0.12.36 (Active X)...
"%WINDIR%\System32\msiexec.exe" /I "%DEPOTDIR%\install_flash_player_active_x.msi" REBOOT=REALLYSUPPRESS ALLUSERS=1 ADDLOCAL=ALL /qb!-

echo Installing Adobe Flash player v10.0.12.36 (Firefox)...
"%WINDIR%\System32\msiexec.exe" /I "%DEPOTDIR%\install_flash_player_plugin.msi" REBOOT=REALLYSUPPRESS ALLUSERS=1 ADDLOCAL=ALL /qb!-

echo Disabling Auto Updates...
if not exist "%windir%\system32\Macromed\" md "%windir%\system32\Macromed\"
if not exist "%windir%\system32\Macromed\Flash\" md "%windir%\system32\Macromed\Flash\"
copy /Y "%DEPOTDIR%\mms.cfg" "%windir%\system32\Macromed\Flash\"

:endscript
ENDLOCAL


I have tried moving everything to a local directory so that the installers are not being run via a UNC share but I get the same results.  I also tried stripping all of the Properties from the command line with no success. Does anyone have any suggestions on how to script these installers? What am I missing?

Thanks in advance!
-Adam