Okay, here is the problem. When I play games such as Call of Duty, Medal of Honor, Rainbow 6 Three, Enemy Territory and Americas Army, my computer repeatedly freezes and occasionally blue screens. When it freezes, the video locks up and the sound loops (if a gun is shot just as it freezes, the shot is repeated over and over sounding like full auto fire). Most of the time, the game resumes after 30 seconds or so but then re-freezes immediately to up to several minutes later. When it blue screens, it happens during a freeze and from what I can read of the message, nv4.dll is the cause from an infinite loop condition. I built my computer with the following parts: CPU: AMD Athlon 64 3000+ Winchester 1GHz FSB Socket 939 Processor Model ADA3000DIK4BI MB: ASUS A8V Deluxe Socket 939 VIA K8T800 Pro ATX AMD Motherboard PS: Thermaltake Silent Purepower W0014RU ATX 480W Power Supply Memory: CORSAIR ValueSelect 512MB 184-Pin DDR SDRAM DDR 400 (PC 3200) Unbuffered Model VS512MBB400 X 2 Video: MSI FX5900XT-VTD128 Geforce FX5900XT 128MB DDR AGP 4X/8X Hard Drive: Western Digital Caviar SE WD1200JD 120GB 7200 RPM Serial ATA 150 Hard Drive X 2 Heat Sink: Thermaltake Venus Series Coolers-Silent Boost K8 The obligatory floppy drive to load SATA drivers, the DVD CDRW drive, a sound card, case and 17" flat panel monitor. I have tried updating the motherboard bios, the video card bios, the video driver (MSI's version and straight from nvidia) with no luck. Originally, the sound card, video card and onboard firewire shared IRQ numbers. Since I don't have any firewire devices, I disabled the firewire in the bios and move the sound card to a different pci slot. I'm running winXP Pro SP2. I have some ideas as to what the problem can be but I need some help. First is the power supply. I think it should be sufficient. Second is cpu overheating. What is normal temp range for my processor? Third, bad video card. Doubtful since everything but my games work fine. Can anyone help me?