Folder Usage

Product: Folder Usage
Company: Nodesoft
Website: www.nodesoft.com
Type: Free
Requirements: Windows XP/Vista/7

Which of my folders are using the most space?
Are there folders that use much diskspace that I don't know of?
Why is C drive running out of disk space?

I wanted the answers to these questions, and most programs that I found out there where too expensive for me. And the free programs could not do what I wanted them to.