You can use WinDirStat to Free Up Space on your Hard Drive Windows. Use it to find areas on your computer where you have a buildup of files. If you’re running out of room on your computer, this can be very helpful as it makes a visual map of your drive and a tree making it very easy to see where you have lots of files. Windirstat application is free and distributed under the GNU license. This application allows you to scan your whole hard drive and understand what takes space, shows folders size and software sizes as well and ways and means to free them up.