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#11
Type Backup in Start Search box. Do you have scheduled backups? I recently deleted a series of those on an External which appeared to be old scheduled backups.
If not they could be Windows Update staging files that are normally cleaned up by Disk Cleanup. Someone will know for sure.
I would run CCleaner disk and Registry tabs now to clean up unneeded temporary files. It often finds 1-5gb of schmutz when I run it on a dirty computer.
Then I would perfectly organize your disk by running Puran Defrag Free Edition
Boot Time Defrag with Full Disk Check and Intelligent optimizer enabled on the Add'tl Operations tab.