Thanks for the slipstream info.
I have complied a SP2 disk, but have not tested it yet.
A friend gave me a copy of Windows 7 eval and I loaded it.
It recognized 480ish Gigs right away and partitioned it with no problem.
I went ahead and installed 7 and will play with it for a while to see if I like it.
If not, I'll be back to XP ;)
Of course, now that the partition is corrected (at least somewhat) I won't know if the slipstream version made a difference. And no, I'm not gonna try to make it happen again for the sake of science! ;)