What information can be removed?
What information can be removed?
You have Windows 10 running smoothly. With 20GB less on your SSD, consider removing unused files and folders. The three new folders on the C drive are likely temporary or recent downloads—check if they contain unnecessary data. Old files in Windows.old can also be deleted to free space. Focus on clearing temporary files, apps you no longer use, and duplicate documents.
I just ran CCleaner and checked the box for "Old Windows Installation." It removed the Windows.old folder and $Windows.~BT. I manually cleared the $Windows.~WS file. After restarting, everything looks normal and unchanged, so it seems safe to delete those files.