As Windows continues to develop and release newer versions like Windows Vista, Windows 7 and Windows 8, Microsoft was bound to cut off some programs and stop including them with the default Windows installation. The developers who created the freeware application Classic Shell have put together a set of tools in order to allow Windows owners to continue to use older sets of tools they've gotten used to.
Classic Tools includes a bunch of things which have been removed, but the most important to mention are some of the re-additions to the Windows Explorer including shell menus to Goto parent directory, Copy/Paste/Delete buttons and others which may be added. Some of the UIs which were changed in Windows Vista are now also accessible again in newer versions of Windows so that you're able to maintain Windows XP functionality.
Version 4.3.1 is a freeware program which does not have restrictions and it's free so it doesn't cost anything.
Virus and Malware Tests: The program has been tested with several antivirus applications and has tested clean of viruses, malware or trojans.