Q: I've installed SP1 on my Windows 7 and Windows Server 2008 R2 systems. How do I remove the old files that are backed up for service pack removal purposes?

A: When a service pack is installed, the files that get replaced are packaged up and stored on the local machine so the service pack can be uninstalled if necessary. You can remove these files to save space, or if you're creating a base image that will be duplicated and you don't want extra space consumed. The easiest way to remove is using the DISM tool, as follows.

C:\Users\john>dism /online /cleanup-image /spsuperseded

Deployment Image Servicing and Management tool
Version: 6.1.7600.16385

Image Version: 6.1.7600.16385

Removing backup files created during service pack installation.
\\[=====================

100.0%
=====================\\]
Service Pack Cleanup operation completed.
The operation completed successfully.

This process may take a while, depending on the performance of your machine.

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