Most likely bad hardware. Post up the error when you find out. I know when I was loading XP on my HECC, it refused to install. Later found out that it was due to the memory not being the right memory for my mobo (I've got pc100, the board only goes down to pc133, so it's causing my memory to be overclocked a tad). All I did was remove one of the sticks, and it then installed perfectly. I put the stick back in after the install, and it's working fine.
One of these days I'm going to pick up some pc2100...
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