7-Zip self installer?

I'm trying to create a silent installer for my Windows 7 theme, here's my Config.txt

 ;!@Install@!UTF-8!
GUIMode="2"
Path="%Windir%\Resources\Themes\"
Progress="No"
RunProgram="InstallUxStyle.cmd"
;!@InstallEnd@!

and here's my install script.

@ECHO OFF
GOTO DETECT

:DETECT
%PROCESSOR_ARCHITECTURE%
IF AMD64 == AMD64 GOTO AMD64 ELSE GOTO DETECT2

:DETECT2
%PROCESSOR_ARCHITECTURE%
IF x86 == x86 GOTO x86 ELSE GOTO DETECT3

:DETECT3
%PROCESSOR_ARCHITECTURE%
IF IA64 == IA64 GOTO IA64 ELSE GOTO END

:AMD64
msiexec.exe /i "%Windir%\Resources\Themes\Cloud7\UxStyle\UxStylex64.msi" /quiet
GOTO END

:x86
msiexec.exe /i "%Windir%\Resources\Themes\Cloud7\UxStyle\UxStylex86.msi" /quiet
GOTO END

:IA64
Sorry, your architecture isn't supported.
GOTO END

:END
Exit

I'm on Win8 atm because my win7 partition died and obviously my theme is Win7 only, so I can't test it. is this correct, and more importantly, how do I make this actually execute the scripts and programs and everything?

Edited July 21, 201214 yr by marcusj0015