Hi,
As described by
Lawrence Garvin:
The Windows Management Framework v3 update has been permanently pulled from WSUS and the Microsoft Update
Catalog. The installation of WMF3 on Win7/2008R2 systems has several considerations which make it unsuitable for automatic or mass deployment. Several issues were encountered as a result of the installation which led to its removal.
You can download here:
http://support.microsoft.com/kb/2506143
Hope this helps.