My system: Custom Built: Intel 37400 Core2Duo 2.80GHz 1066FSB 3mbL2 ASUS P5n32-E SLI Plus Mobo 4x1GB Kingston Hyper X Ram DDR2 Hitachi Deskstar 500gb SATA ***NOW DECEASED*** WD Caviar Green 500gb SATA EVGA Nvidia 8800GTS Vid Card Ok here goes: This rig previously had Vista 32bit on it (only licensed copy i had at the time of assembly) I decided the other night to try installing windows 7 64bit. At this point i had the Hitachi hard drive installed, and up until tonight never had any problems with this setup. First i tried installing off of the DVD, it would get through the 2 bars of loading files and then BSOD with something pointing to 'drivestor'(?). I did some reading and found that W7 could get finnicky with 4gb of ram, so i removed 2 sticks and tried again. This time it got past the loading, but it would get to the setup screen and tell me that the DVD/CD driver was not found. I did a bunch of reading and found that disconnecting the DVD/CD and installing off of a bootable USB with the image on it. So i went through the proper steps and did this. I created a bootable usb, and tried it on the desktop. The result: stuck at the 'Starting Windows' screen for over an hour with the HDD indicator solidly on (but no noticable sounds coming from the harddrive.). I then stuck the bootable usb into my laptop (which i'm currently typing on now) and win7 installed perfectly, quickly, and without error. So i know the boot disk works. BTW, this laptop is a Dell XPS M1710 that was running Vista 64 on it previously. So i took the SATA harddrive out and put in an 80gb IDE WD Caviar that i had laying around. Windows installed easily on this harddrive. It seems like there is some sort of conflict with windows 7, and my SATA setup. I dont use RAid configuration, my bios is at default settings, and i'm about to pull my hair out. Oh yea, i somehow managed to brick the Hitachi disk, when i put it back in, the PC didnt recognize it. I took it to bestbuy and they tested it and said it was bad, hence me buying the new WD Caviar 500. Note: The current WD Caviar 500 is recognized by bios, as is all 4gb of ram. Any insight into this? i'm at a loss.