Thanks guys.
I did upgrade to CCleaner v3.22.1800 when I started replying on this thread although the Tools>Driver Wiper>Full Erase feature now no longer works (says 'Disk is not ready' on external USB pens/SD cards) although the Free Space feature stills works.
'Dariks Boot And Nuke' would blitz the drive leaving only 20 files, I assume they are part of the partition process. CCleaner's Drive Wiper however leaves hundreds of file names, zero byte files and not-so-securely overwritten files even on a WinXP SP3 system using the secure-erase 35-pass feature.. I used the latest Recuva to do a comparison test.
I'm just making a suggestion as I have no right to complain about free software not working on a 13yr old OS, CCleaner has to be the finest piece of software ever. It's just not quite as deadly in the forensic department as DBan.