Deploy powershell script - Uninstall Forefront

Question

Hi
Im trying to build a powershell script that uninstall Forefront Client and later install SCEP and it also copy the local exclusions from Forefront to insert in SCEP (registry).
All works fine when Im running the script locally, but when Im deploying it from Altiris DS it halts on Microsoft Forefront Client Security Antimalware Service". Every time, I also have tried to sort them differently but it wont work.
All I see in the event viewer is a warning:
"Application 'C:\Program Files\Microsoft Forefront\Client Security\Client\Antimalware\MSASCui.exe' (pid 1964) cannot be restarted - Application SID does not match Conductor SID.."
And then later an error:
HRESULT:0x80070643
Description:Cannot complete the System Center Endpoint Protection installation. An error has prevented the System Center Endpoint Protection setup wizard from completing successfully. Please restart your computer and try again. Error code:0x80070643. Fatal
error during installation.
This is the deployment from Altiris:
powershell.exe -noexit "& 'C:\Temp\ForefrontSCEP.ps1'"
Does anyone has any clue?
Cheers!
**** The script ****
# Backup Forefront registry data
Reg export "HKLM\SOFTWARE\Microsoft\Microsoft Forefront" C:\Temp\SCEPClient_New\exclbackup.reg
# Create new registry item
new-Item "HKLM:\SOFTWARE\Microsoft\" -Name "Microsoft Antimalware"
new-Item "HKLM:\SOFTWARE\Microsoft\Microsoft Antimalware\" -Name Exclusions
# Copy Forefront registry exclusion data to newly created regkey
Copy-Item "HKLM:\SOFTWARE\Microsoft\Microsoft Forefront\Client Security\1.0\AM\Exclusions" -Destination "HKLM:\SOFTWARE\Microsoft\Microsoft Antimalware\" -Recurs
# "Uninstall Forefront och MOM"
# "Uninstall Microsoft MOM"
$app = Get-WmiObject -Class Win32_Product | Where-Object {
    $_.Name -match "Microsoft Operations Manager 2005 Agent"
$app.Uninstall()
# "Uninstall Forefront Assessment"
$app = Get-WmiObject -Class Win32_Product | Where-Object {
    $_.Name -match "Microsoft Forefront Client Security State Assessment Service"
$app.Uninstall()
# "Uninstall Forefront Antimalware"
$app = Get-WmiObject -Class Win32_Product | Where-Object {
    $_.Name -match "Microsoft Forefront Client Security Antimalware Service"
$app.Uninstall()
# Install SCEP with policy
Start-Process -FilePath C:\Temp\SCEPClient_New\scepinstall.exe -ArgumentList "/s /q /policy C:\Temp\SCEPClient_New\ServerSCEP.xml" -ErrorAction SilentlyContinue

Answer 1

I finally solved, in two ways.
For the powershell part:
I changed the name match against a filter function. So now I can deploy the powershell script just fine.
$app = Get-WmiObject -Class Win32_Product | Where-Object {
    $_.Name -match "Microsoft Operations Manager 2005 Agent"
$application = Get-WMIObject Win32_Product -filter "Name='Microsoft Operations Manager 2005 Agent'"
2nd solution:
I also created a batch file which worked at my first try. Gotta love the old fashion way :)
I post it here as well, maybe somebody can get use of it.
Uninstall Forefront - Install SCEP - Copy local exclusions
REM Backup Forefront exclusions
regedit /e C:\Temp\ForefrontExclBackup.reg "HKLM\Software\Microsoft\Microsoft Forefront"
REM Create SCEP registry keys
reg add "HKLM\Software\Microsoft\Microsoft Antimalware"
REM Create SCEP registry keys
reg add "HKLM\Software\Microsoft\Microsoft Antimalware\Exclusions"
REM Copy Foreront exclusions to SCEP
reg copy "HKLM\Software\Microsoft\Microsoft Forefront\Client Security\1.0\AM\Exclusions" "HKLM\Software\Microsoft\Microsoft Antimalware\Exclusions" /s /f
REM Uninstall Microsoft Forefront Client Security State Assessment Service
MsiExec.exe /X{E8B56B39-A826-11DB-8C83-0011430C73A4} /qn
REM Uninstall Microsoft Forefront Client Security Antimalware Service
MsiExec.exe /X{436028CD-6476-4224-9274-8F0320F30FD1} /qn
REM Uninstall Microsoft Operations Manager 2005 Agent
MsiExec.exe /X{F692770D-0E27-4D3F-8386-F04C6F434040} /qn
REM Install SCEP and policys
C:\Temp\SCEPInstall.exe /policy C:\Temp\ServerSCEP.xml /s