May I humbly offer a debug script to remove non DOS partitions? This is what I use when I botch a Linux install or get tired of what's on my hard drive and I want to get rid of everything on the drive, including partition info that fdisk can't seem to remove. I know of no other way to make the drive more blank. (except to expose it to a strong magnetic field) Here it is:
Boot with a windoze 98 boot disk.
type the following lines and hit enter after each one.
f 200 l1000 0
(just hit enter once now)
it should say "program terminated normally". Just reboot and run fdisk and format and install any darn thing you want.
Hugs and kisses,