Installation in Safe Mode

Hello,

I am trying to install Microsoft AntiSpyware in Safe Mode on Windows XP.
This is a part of a batch file that I have created to clean out a system of
spyware when it's to far gone to do the cleaning in standard Windows or if
Windows will not boot into anything but safe mode.

I want it to install silently, scan silently, and uninstall silently. I am
using other scans such as SpyBot, Ad-Aware, Hijack This, and SpySweeper, and
I have gotten them to work in this environment without any problems.
However, I seem to be getting a snag with the Microsoft AntiSpyware and the
Windows Installer Service / MSIServer (msiexec.exe).

Silent Install command:
MicrosoftAntiSpywareInstall.exe /s /v /qn

Silent Scan command:
GIANTAntiSpywareMain.exe -scan

Silent Uninstall command:
MsiExec.exe /X{536F7C74-844B-4683-B0C5-EA39E19A6FE3} /Q

When I go to install it cannot because the Windows Installer service is not
running. To alleviate this I did a "net start MSIServer", however, this
service cannot be started in safe mode. This silent install working in
standard Windows but I need it to run in safe mode for my purposes.

Has anyone found a way around this or is there another way to get this to
run. I have gotten other spyware programs to work doing this and I would
prefer to get Microsoft AntiSpyware to run instead.

Thank you,

Damon