OK, I am past the point of frustration. I have a Compaq system running Win XP Pro, IGHz, 128 MB SDRAM, Radeon 7000, 40GB Western Digital. The system kept locking up so I replaced the power supply (300W), the memory stick, hard drive, video card (with the above listed peripherals), got a new fan and heat sink for CPU, purchased and installed a new copy of XP Pro, updated all drivers and the stinkin' thing still locks up after a few minutes. What can I try next? Thank you!