There may be some random wierdness in the portion of the drive you are now trying to use with xp.
One thing I would try is to backup the XP partition to a disk image on some external media. (you should do this anyway just for the hell of it - you never know when you'll need an external backup)
Then, get rid of the partition and make a new one of a similar but different size. Finally, restore your disk image to the new partition and see if its faster.
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