My free disk space has been decreasing constantly in the past months. Originally it was at 5 Gigabytes of space, and then the next day it was down to mere megabytes. I continually do Disk Defragmentation and Disk Cleanup but it hardly does any good. Some days it will go up a couiple megabytes, and then the next minute it is down to KB.
Your system wouldn't be able to run with zero free space. And you can't run defrag unless you have a minimum of 15% free space. When's the last time you cleaned up after yourself? And I don't mean disk cleanup. Download CCleaner Slim (last on the list), install & run it. Remove everything it finds:
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