OK, I did a non destructive backup several months ago. It backs up everything you have, even the windows files in C:\Backup [date] and installs a fresh new OS.
Well I got everything I needed from this backup folder, I have fresh windows files, but many of the remaining windows files can not be deleted for some reason. (All located in the BACK UP folder.)
It gives me errors like the files are in use, which they are not, or I do not have permission to delete, even though I am the Admin.
It takes up considerable amount of space. I think almost 2GB.