System Update Readiness Tool for Windows 7 – KB947821, Download It
Microsoft has released a system update tool for Windows 7 users because an inconsistency was found in the Windows servicing store which may prevent the successful installation of future updates, service packs, and software. This tool checks your computer for such inconsistencies and tries to resolve issues if found.
This download is only available to those users who are running Genuine Windows.Means you need to validate your system before downloading this update.
You can use following links to download this update:-
Download For 32 bit ( Or x86 )