Uninstall Invisible OS (Windows 8 Preview) - Appears in boot

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http://superuser.com – I've been using Windows 7 for three years now with no other operating systems. When the Windows 8 consumer preview came out last year, I partitioned my hard drive to dual-boot Windows 7 and 8. When the preview ended, I stupidly went and deleted the partition Windows 8 was on instead of uninstalling it however I should have. However, since the free space merged with my existing partition, I didn't think anything of it. Today, I partitioned my hard drive again to install Ubuntu. It told me it detected multiple OS's (Windows 7 and 8). How do I get rid of Windows 8 completely? (HowTos)