What could be causing the system to suddenly have several GB of memory occupied?

Question

Windows

This means a thing: there were 100GB free, installed a game that took 10GB, then deleted it, including the folder with possible saves, etc., cleaned the registry, cleaned up the disk, even rolled back the system to a restore point, but still missed 5GB. During the installation of the game, some Windows libraries were downloaded, I think that perhaps they take up space, I would like to know if there is a convenient way to calculate and delete them? Maybe by the time of installation, such as the last to delete or something else?

Answer 1

It is likely that a shadow copy remains. You didn't seem to clean them.

cleaned the registry

Weird. Why clean the registry? Is he dirty? And how can you clean it up?