If you are fine with command-line interface, there's a couple of options I
can recommend:
- Built-in CIPHER utility has /W switch that performs DoD-compliant (read
safe) multi-pass wipe of free space on any disk you point it to. For more
info refer to "CIPHER /?" help. Cons: it doesn't work with files, only with
free space so you need to Shift-delete file in question first. Also, wiping
the whole free space can take considerably more time than a single file.
- Sdelete.exe utility from Mark Russinovich is available as free download
from Microsoft web site:
http://www.microsoft.com/technet/sysinternals/Security/SDelete.mspx
Cons: it doesn't have GUI
If you need a GUI application, I'm sure you can find plenty of them by using
keywords like "safe delete" or "wipe" in your favorite search engine.