[panic]Fatal trap 12: page fault while in kernel mode

Hello. Trap 12 occured when I rebooted PC. Sending you backtrace. My system: amd64 3200+ Venice, MB ECS nForce4 A939,Samsung 250GB and WD 250 GB, 2 memory banks 512MB each, videocard: Geforce 6600gt 128MB, NIC on realtek chip, sound card cirrus logic cs4281. It's very unstable, crashes happen ever

[panic]page fault while in kernel mode

Hello. Trap 12 occured when I rebooted PC. Sending you backtrace. My system: amd64 3200+ Venice, MB ECS nForce4 A939,Samsung 250GB and WD 250 GB, 2 memory banks 512MB each, videocard: Geforce 6600gt 128MB, NIC on realtek chip, sound card cirrus logic cs4281. It's very unstable, crashes happen ever