Ok, for some backgound, this has happened before.
Yes, like an idiot, I loaded service pack 1 again. But I have it narrowed down to NIC. This system has 3 nic cards installed. I have them all 3 disabled. If they are disabled, the server will boot. As soon as I go into the device manager and enable one of the nics, it bluescreens with BAD_POOL_HEADER and stop error 0x00000019, same as before.
Any insight as to why? I've loaded newer drivers, older drivers, nothing! There are 2 different brands of nics in here. One is an Intel Pro 1000 MT, and the other 2 are 3COM. I'm trying a different nic right now, a Netgear FA311.