Windows XP Update blue screen

Just re-built my machine and slapped XP Pro on here. Went to do an automatic update for XP SP2 and when the computer restarts, I get the blue screen of death. Tried installing from a known good CD as well and same result. Have new motherboard, CPU, and graphics card in the comp now, but can’t see this causing the computer to crash after updating the SP… Anyone have any ideas?