Uncomment xml node using batch file or powershell

How can I uncomment a node in XML file using command prompt with powershell or simple batch file.

<Settings> 
<SettingNode name="Installation">
<SettingNode name="Features">
      <Setting name="Features" scope="Installation">
        <StringArray>
            <!-- Uncomment the below line to activate the required features for the Pilot Version-->
            <!--<String>PilotVersion</String>-->
            <String>GlobalSearchAndReplace</String>
        </StringArray>
      </Setting>
    </SettingNode>
</SettingNode>
</Settings>