This utility will break down every file and folder showing you exactly where the majority of your disk space is going!!!

Here are some of the features

WinDirStat reads the whole directory tree once and then presents it in three useful views:

The directory list, which resembles the tree view of the Windows Explorer but is sorted by file/subtree size,
The treemap, which shows the whole contents of the directory tree straight away,
The extension list, which serves as a legend and shows statistics about the file types.

Coupling. Select an item in the directory list: The treemap highlights it; and vice versa.
Zooming.
Built-in cleanup actions including Open, Show Properties, Delete.
User-defined cleanups (command line based).
Works with network drives and UNC paths.
‘Create disk usage report’ option.