I put together my pc last week, it booted up fine, but in my games, and sometimes when I go to change the screensaver where I preview it, it locks up, not like freezing the same exact image forever, but like scrambled boxes repeated everywhere, thus making me have to reboot, sumtimes rebooting itself. So some people on here recommended another driver, so I had a friend install the new driver, and now it locks up right after it says Windows XP Pro splash screen, just like, right after the XP Pro goes black, it locks up with the same scambled lock-ups and reboots. My friend at first thought it was a heat issue with both the vga and cpu, so we installed my Bigwater Kit (water-cooling kit) and after putting it in and running 5-10 minutes, it does the exact same, but when in the bios, I checked the cpu heat, it was pretty much the same as my stock intel heatsink/fan was, in the 50-60'C range, which I believe is high? Thing is, before my friend installed the new driver, my system actually worked, it just locked up in games, and now it doesnt boot up to the main screen. He said tomorrow he will stop by and reformat my hdd to see if it will work on his and then put it back into mine. But while were at it, I seriously need some suggestions about what the problem currently now is, the booting up after Windows display and locking up, thus rebooting. Also, maybe some ideas about the heat issue. My friend knows enough about computers that he says the VGA card is NOT defective, as I played Half-Life 1 on it before, but nothing past Direct X9 games and whatnot. Again, ideas/suggestions are needed. Here is a list of my specs. Windows XP Pro OS ASUS P4P800 SE Socket 478 Motherboard intel Pentium 4 Socket 478 3.0e GHZ Prescott Processor CORSAIR XMS PC-3200/DDR 400 2x 512MB Ram (1GB Ram) Seagate Barracuda 200GB IDE Hard Drive XFX Geforce 6800GT 256MB 256-bit AGP 8x VGA Card ASPIRE Chameleon 550watt PSU DVD-Drive DVD-Burner Floppy Drive ETC... By the way, dont bother listing, 'Set the boot device to the hdd or the drive' as I tried both and nothing happened. And the rail voltages on the PSU are above the listed rails, like 1+,3+,5+,12+ voltages, but of course, this doesnt mean its a good PSU, but then again.. Thanks and help would be greatly appreciated.