Partition Deletion Error?

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http://www.linuxforums.org – I've installed Linux quite a few times on many different computers and for some reason, I'm stumped. I went to ubuntu.com and burned myself a boot-disk. Afterwards I went to my dad's original ME box and when I tried deleting the partition I got an error that said, "Could not change partitions, cause the disk could not be locked". Help me out here. (HowTos)