1. The O&O DiskStat Homepage displays an overview of your hard disk(s) with all available drives and their free and occupied space. From here you can navigate through your computer and hunt down space wasters.

2. If you have selected a drive for analysis, click in the Tool Bar on "Start Analysis". The largest folders and files on the drive will be displayed. You can use various types of charts, for example Bar Chart...

3. Doughnut Chart...

4. or Treemap

5. Double-click on a bar or doughnut segment, and the program will display these "Sub-Folders". By right-clicking on a doughnut segment, you can delete files or folders over the respective context menu.