Fear no more Kimosabe. (For those of you to old to remember the friend of the masked man.... I am envious, because you probably still have a full set of hair too. )
The Windirstat program (http://windirstat.info/) (Windows only tool.) is a great tool for finding those files. It is a free program, that is easy to run. It is a small utility that is easy to install and can even be dragged to a pen drive or a network drive and ran from there as well!
Just yesterday, we found one folder in a teachers network drive that they no longer needed from 2003. This folder was taking up 250 meg of network space.
Give it a try, and start deleting!