可能重装方法不对

from win2k to xp, you cannot overwrite origainl win2k.
(maybe become multi OSs if do so, then have to set the priority, otherwise will still boot the original one, and become compilcated)
have to format the disk, and install, and make sure to booting OS from the disk (or partition) your xp is installed.

Or you did install XP on a partition, just need to specify to boot the OS from that partition.

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