The Norton Speed Disk defragmentation tool is part of the paid Norton Utilities software; a 30-day free trial version of this software is available on the Norton website and CNet.com. This software is compatible with Windows XP, Vista, 7 and 8 as of 2015.
To download the free trial of Norton Utilities from the Norton website, click Free Trials in the menu bar at the top of the page. Once there, click Free Trial under Norton Utilities, and click the Download Free Trial button to start downloading. Alternatively, navigate to CNet.com and click Download in the menu bar at the top of the page. Enter "Norton Utilities" in the search text box, press Enter, and click the link for Norton Utilities in the search results. Click the Download Now button to download the software.