|If I were you, I would use a tool, to check the folders size to figure out, where (in which folders) all the diskspace is used.|
I use TotalCommander for such things. In TotalCommander, you go to drive C:\ and press the keys ALT+SHIFT+ENTER and is calculates the amount of MB or GB of data stored in the folders.
Then you go into the folder which the most used space an start again with ALT+SHIFT+ENTER.
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