Just run the installatoin for the new version, and specify that you want it to be installed on the old HD. Not sure how it is in the other distro's, but in Slack, you just use fdisk to set up the partitions, and in Mandrake it's all very easy and graphical. The hardest part is probably setting up a bootloader, and that isn't hard at all (at least for lilo... i've never used grub)
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