Hi everybody, I built up a computer a few days ago. The first day everything worked out fine. I played games like crysis and mass effect 2 with the highest resolution without any problems. Recently when I surfed the internet a bluescreen came up saying "page fault in nonpaged area" and the pc rebooted. That appeared about 5 times in frequent intervals. After the pc crashed about 5 times everything worked fine for the rest of the day. That appears every single day. It's like the pc need a warm-up-time. First I tried to format the harddrive but without success. It still crashed... Then I tried it with another harddrive because sometimes the bluescreen also contains something with "page fault in non paged area - ... ntfs.sys". It also appeared with the other one... Then I tested the ram with Memtest 86+ via boot-cd. I've got 4gb and I first checked one 2gb unit for 24h (50 times pass 0 errors) and antoher day I took the other 2gb and also 50 times pass with 0 errors. My hardware: MSI 770c45 AM3 MSI HD 5770 BeQuiet Pure Power 430W 4GB-Kit G-Skill PC3-12800U CL9 AMD Phenom II X4 925 Box, AM3 I just installed Win 7 and the newest ATI driver for the HD 5xxx Series. I've read a few similar stories here but I couldn't solve it. Anyone who has got an idea? Thank you in advance!