Since installing COD4 a few weeks ago and updating to 1.4 I have been having a random shutdown problem. I have the following setup on my computer: AMD Athlon 64 X2 5200+ Windsor 2.6GHz Socket AM2 Foxconn C51XEM2AA- 8EKRS2H AM2 NVIDIA nForce 590 SLI MCP ATX AMD Motherboard Dual Foxconn FV-N88SMBD2-ODOC GeForce 8800GTS 640MB 320-bit GDDR3 PCI Express x16 HDCP Ready SLI Supported HDCP Video Card Integrated sound until my sound card arrives Antec True-Power 650W Power Supply 4x BUFFALO Firestix 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Coolmax Cosmos Full Tower case with 4 120mm fans I'm currently running Windows XPsp2 until my new copy of Vista Ultimate arrives. I do not have any additional cooling on the machine at this time though I will be buying a Zalman fan cooler for the processor. The problem is this.... When I'm playing any other game, from WoW to Battlefield 2 to America's Army I have no problems. When I'm doing anything "normal" on my computer, I have no problems. When I'm playing CoD4 (with or without patches) the computer will randomly shut down in both single player and multi-player modes.