Hi. For starters, I strongly advise you not to use the Gutmann patterns. They're overkill, they take up too much time, and as a result, many people don't sanitize media that they should be sanitizing.
DBAN works really well (dban.sourceforge.net).Eraser also works really well. I don't understand your concern that "it made registry changes and required a reboot."
if you are using Windows Professional (2000 or XP), you can just use CIPHER.EXE. What's wrong with that?
