http://blogs.technet.com/doxley/archive/2008/05/28/uninstalling-the-uninstall.aspxWindows Vista is a pretty big install, and then when you add to it the install of Service Pack 1, it becomes even bigger.&#160; So, once you have been running Service Pack 1 for a while, you can safely remove the uninstall files for the Service Pack.&#160;en-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/doxley/archive/2008/05/28/uninstalling-the-uninstall.aspx#3072489Tue, 17 Jun 2008 08:09:23 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3072489Saw<p>Hi,</p> <p>How should I uninstall SP1 after I remove &quot;uninstall files&quot;?</p>http://blogs.technet.com/doxley/archive/2008/05/28/uninstalling-the-uninstall.aspx#3072942Tue, 17 Jun 2008 21:27:16 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3072942Daniel Oxley<p>If you have removed the uninstall files, then you'll have to reinstall the operating system if you want to go back to Vista RTM.</p> <p>HTH,</p> <p>Daniel</p>