I used this script to get all the com objects related to Altiris:
Get-ChildItem HKLM:\Software\Classes -ErrorAction SilentlyContinue | Where-Object {
$_.PSChildName -match '^\w+\.\w+$' -and (Test-Path -Path "$($_.PSPath)\CLSID") -and $_.PSChildName -like "Altiris*"
} | Select-Object -ExpandProperty PSChildName
Then to use one of them, I used:
$AltirisComObject=New-Object -ComObject <Name of Com Object>