For total security, you need DriveScrubber3.
Permanently erase files, pictures, documents, credit card info, bank statements, passwords and more
Securely wipe all drive data before selling, donating or recycling your PC
Restore your drives to like-new after virus or spyware damage
Wipes PC drives, flash drives, cameras and more
How to Download:
Proceed to checkout,
Fill up the form, When you select Australia as Country, leave STATE as "other"
then
check your email for Activation Key and Download.
Cheers
JJBYPC Australia
System Mechanic isn't too bad too. Once you have bought it they regularly offer extra years for $14.95.