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Windows comes with a built-in “disk cleaner”, but several third-party system utilities have them as well. The problem is that those utilities can only find and eliminate files that are created and left behind by your system and applications. The files you create, well, there is nothing they can do about those. After all, you are (for now) still the master of your system, and the utilities must respect that you just might actually need the lyrics to Flying Purple People Eater in eleven different places on your hard drive.
Unfortunately, now that Internet browsers allow you to easily delete their temporary files, there probably aren’t a lot of junk files lurking on your PC anymore, at least not compared to the files that are yours. In order to really clean up your disk you will need to get in there and delete those files that you never will need again. But, it is so tedious to go through your directory tree finding an 8KB file here and there inside directories with three or more files each, before moving on to the next directory. What you really need is a way to see which files and directories are actually hogging all that disk space.