System Update Readiness Tool (CheckSUR) has been updated to to work on Service Pack 1 installations for Windows 7 and Windows Server 2008 R2.

Update information. After you download the System Update Readiness Tool, it runs a onetime scan for inconsistencies that might prevent future servicing operations. This scan typically takes less than 15 minutes to run. However, the tool might take significantly longer on some computers. The Windows Update progress bar is not updated during the scan, and progress seems to stop at 60% complete for some time. This behavior is expected. The scan is still running and you should not cancel the update.