The install stops because setup can't find a file. I swap CD's and it finds it, continues, then stops again. Swap CD's, it keeps going. Stops again. Is this a bad CD drive or bad CD's?
Have you checked for scratches on the CDs? A bad drive shouldn't give you a files missing error. Generally it just stops and freezes the install. I'm going with bad disks on this one.
Both burned. One is pretty new nLite burn and the other is fairly old. Looks like it's a RAM issue though. Memtest returned some errors. That'll teach me to run all tests before installing.