I installed Free Commander a couple of weeks ago after finding a new beta version on a site I frequent. The stable version I use is one of the most useful programs I have. You basically get two panes to move files around etc.
The thing I most find useful is being about to access hidden & system files without resorting to un-hiding & hiding, there is also an excellent search facility. Also a drop down menu with all main hidden files such as send to, new etc, I love that. You can also access services & the like with one click.
There are of course many other alternatives some of whch are pay programs that are not much better, but I really like FC & it is freeware.
Beware though when using it you are in parts of your PC that are usually hidden or system & deleting the wrong file could cause your PC to revert to none booting state.
It does depend on how you use your PC whether or not you need such a program though. Don't flame me if you don't need it please. There is a new beta on the site that seems to work OK but I settled on the last final.