I have one called "Boot and Nuke" that boots from CD and erases all hard disks attached to the system with a secure erase. If you're concerned about ensuring data on the existing partitions can't be retrieved, you need to use a "data shredder" or "mil-spec erase" utility in my experience, these are often bootable Live CDs with a limited Linux OS and (often auto-running) utilities tailored specifically to erasing data. If all you're after is clearing the existing data so it won't interfere with a clean install of Windows, creating a new partition table and partitions along with formatting the partitions is sufficient Windows installers at least up through 7 would do this automatically if you answer the prompts that way.
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