Windows 7 and Windows 2008 R2 SP1 revision issue
A new SP1 revision was released earlier this week to address some minor installation issues. There is a detection problem with this new revision that can cause the Service Pack to be installed on computers that already do have SP1 installed. Be sure to check the orignal post from the WSUS product team In Configmgr. the old SP1 version is automatically being expired thus you are forced to download and deploy the new revision.