I started a new thread as requested. Since my original post below I updated my NIC driver but when I booted the system for the first time this morning it crashed again; next boot was fine. This makes the last 3 days where the PC only crashes on the 1st boot of the day... yesterday it ran for 10 hours using multiple aps with no crashing. I believe it may be a conflict between physical & video memory sharing but need to research more. Original post: Home built system about 2 months old with Gigabyte GA-EP45T-UD3LR motherboard, intel q9550 cpu, Corsair XMS3 TW3X4G1333C9AG 4GB Dual Channel DDR3 RAM - - PC10666, 1333MHz, EVGA Geforce 7100gs 256mb ddr2 pcie, Western Digital SATA 250 drive, Win7 home premium 64 bit oem. I get a BSOD at different times during startup. Sometimes before it makes it to windows, sometimes after I log in. The last 2 times was only the first startup of the day. It even happened once while logged in safe mode. I've reinstalled windows on 3 different drives, ran memtest86+ & windows mem diagnostic with no errors, removed and reinstalled memory, vid card & hard drive to ensure proper seating. The system & cpu only run about 39 degrees celcius. I don't want to just start buying more parts ie. vid card or memory. I've attached a zipped folder containing .dmp files from the past 4 days since reinstalling windows. I could really use some help.