Ah yes, sorry. I was under the impression that you wanted to wipe *everything* on the drive. I assumed that included the OS. As David said, don't use DBAN if you want to keep anything, like Windows or any other OS.
If you just want to erase the whole OS drive, maybe using DBAN (Darik's Boot and Nuke) is an idea. There's a section here on this forum for DBAN support, here.
The DBAN site itself can be found here.
This is what it says in the "about" section:
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