TreeSize Pro. C:\Windows\CSC. Deleted d8, d7, d6, d4, d3. System file warnings ignored. Outlook had to be closed. Unable to delete d5, d2, d1 due to open program and access errors. A similar procedure was done on my office desk top machine a week or so ago by Rent-A-Geek – though she cut and pasted the folders to an external drive rather than deleting them.