Removing Duel Boot

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I got Winxp and win2k installed as a duel boot, im currently using xp and the win2k folders are in my c directory, i just want to remove 2k from my computer, and keep xp with out reformating or reinstalling.. what do i do...
when i put winxp cd in i was told to pretend as if i was reinstalling xp and delete the partion then quit, but i see one partion, and im afriad if i do, it will format xp.. HELP i also have win2k cd