Microsoft has released the May 2012 issue of the System Update Readiness Tool

This tool is being offered because an inconsistency was found in the Windows servicing store which may prevent the successful installation of future updates, service packs, and software.

System Update Readiness Tool for Windows Server 2008 R2 x64 Edition (KB947821) [May 2012]
System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2012]
System Update Readiness Tool for Windows Server 2008 (KB947821) [May 2012]
System Update Readiness Tool for Windows Vista for x64-based systems (KB947821) [May 2012]
System Update Readiness Tool for Windows Server 2008 for Itanium-based Systems (KB947821) [May 2012]
System Update Readiness Tool for Windows Vista (KB947821) [May 2012]
System Update Readiness Tool for Windows Server 2008 R2 for Itanium-based Systems (KB947821) [May 2012]
System Update Readiness Tool for Windows 7 (KB947821) [May 2012]
System Update Readiness Tool for Windows Server 2008 x64 Edition (KB947821) [May 2012]