TreeSize Professional is a tool that can help you view the items on your H drive in order to clean and organize them. To access TreeSize Professional on Windows 7, click on the Office button on the bottom left of your computer, then go to Computer. You will see your H drive, which is marked with your username. Right click on your H Drive and choose "TreeSize Professional" from the list of options. TreeSize Professional is not available on Macs.
A video on the TreeSize Professional website will show you how to navigate the program and delete files: http://www.jam-software.com/treesize/videos.shtml.