For those wanting to get rid of the SCCM MP error (introduced in the latest version 6.0.6000.3) "Failed to read %PROCESSOR_ARCHITECTURE environment variable from Win32_Environment WMI class", there is a hotfix available now:
More information, as always, can be found on Kevin Holman's blog: http://blogs.technet.com/b/kevinholman/archive/2011/09/30/mp-update-new-configmgr-2007-mp-version-6-0-6000-3-resolves-top-issues.aspx
That hotfix applies to Server 2008 R2 but our W2k3 SCCM environment threw these same errors after I imported the management pack on SCOM 2012. Any workaround for that OS version?
I saw you posted this on Kevin's blog already - he's the one who can answer you on this :-)