Resolved Using CCleaner's Drive Wiper

I have a friend that want to loan his laptop out to his brother but wants his personal files removed but still wants to keep the OS and program files intact.

Can I run CCleaner Drive Wiper with the following chosen options:

1. Free Space Only
2. Simple overwrite (1pass)
3. Local drive C:

Will this do what he wants done?

 

In a word, no. That would only overwrite the unused space between existing files on drive C:.

If he's running Windows 7, most of his personal files will probably exist in:

C:\Users\{username}\Contacts
C:\Users\{username}\Desktop
C:\Users\{username}\Documents
C:\Users\{username}\Downloads
C:\Users\{username}\Favorites
C:\Users\{username}\Music
C:\Users\{username}\Pictures
C:\Users\{username}\Saved Games
C:\Users\{username}\Videos​