Forcefully uninstall a Forefront Client Security v1.0 client from a system using msiexec

If you are having trouble uninstalling a Forefront Client Security client from a machine (for instance, it is missing from Add/Remote programs for some reason), you can do the following:

These commands all assume that they are being run from a command prompt with administrative rights:

msiexec.exe /uninstall /package mp_ambits.msi /qn
msiexec.exe /uninstall /package momagent.msi /qn
msiexec.exe /uninstall /package fcsssa.msi /qn

Sidenote: That is a handy command line to know (the msiexec.exe /uninstall) if you have a cranky .MSI package that you know was installed but isn’t listed in Add/Remove programs. You can omit “/qn” if you want more feedback on the process.

Thanks to a helpful post from Yaniv on the TechNet forums.