Looks like you've already gotten your situation taken care of, however I'm partial to DBAN:
http://dban.sourceforge.net/
Darik's Boot and Nuke ("DBAN") is a self-contained boot floppy [or CD] that securely wipes the hard disks of most computers. DBAN will automatically and completely delete the contents of any hard disk that it can detect, which makes it an appropriate utility for bulk or emergency data destruction.
Not for Windows, but it does the job. It doesn't care about the disk type or filesystem, it blows away everything as long as it can see the HDD. Great for clean zero-ing as well as security. Completely zaps the boot sector, partition table, data, you name it. Just throw the floppy/cd in, boot, and viola.