After you boot to a command prompt, type the following as shown in blue below,
pressing enter after each and Y for yes when prompted.
First we need to ensure we are in the root drive.
Smart drive speeds things up.
Then we need to ensure we are in the windows directory to prevent serious errors.
Then we delete the subdirectories with the deltree command.
And last we run scandisk.
And then restart the computer and run defrag to recover the disk space.
Or, download and install the small file I made and it will do it automatically
every time you start or restart your computer.
Instructions are in the readme.txt file in the download
Download the file
Go to the Clean Up page