SP1 install woes with forefront

On a test exchange server i've upgraded to the latest version of forefront (at least latest available through MVLS 10.0.0.556), and the pre-req check of SP1 doesn't like it at all. Ive followed MS KB 929080, but to no avail. Still getting this:

Error:Setup cannot continue with the upgrade because Forefront Security for Exchange Server 10.0 was detected. Forefront Security for Exchange Server 10.0 needs to be upgraded to a compatible version of Forefront Security for Exchange Server first and its services need to be disabled to upgrade Exchange Server 2007.Recommended Action: http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.3&id=6dfac22b-581a-4e10-938b-5f2498ead01d

I'm thinking i'll uninstall FF on the test box, install SP1 then attempt to reinstall forefront and re-post my findings.