TreeSize Professional Description:

TreeSize Professional is a powerful and flexible harddisk space manager for Windows 98/ME/NT/2000/XP/2003. Find out which folders are the largest on your drives and recover megabytes on them. TreeSize Professional shows you the size, allocated and wasted space, the number of files, 3D bar and pie charts, the last access date, the file owner, the NTFS compression rate and much more information for several folders or drives you choose. It also lets you search for old, big and temporary files. The application has an intuitive Explorer-like user interface and it is fast and multithreaded. You can print detailed reports or export the collected Data to Excel and to an HTML, XML or ASCII file. TreeSize Pro can be started from the context menu of every folder or drive.