http://www.classicshell.net/
I have this installed on my Windows 7 machine and like it very much.
I have it set up to look like the XP mode start menu with cascaded menus, not the nasty "search for programs" thing W7 comes with!.
I have also used their explorer replacement and like it a lot better than Windows 7s one.
Classic Shell is also available for windows 8 according to their website.
The basic model is free, funded by donations I think.
Worth a look IMHO, especially if you hate the Windows 8 "start screen" or Windows 7 "type programme name to locate it" method.
Andy