THANKS ALL! Thanks to all, I now have recovered 500GB of space. It went from 94.2 GB free space to 594GB of free space. Almost all was for temporary files and thanks to a contributer on another forum,I found 198GB used for system restore files. I turned this off, since I store my files to 3 external drives, and my system files, programs, drivers etc, etc is on the C drive.
Again, thanks all saved me buying a new internal drive!
Dave in NJ