Since a couple of days ago I'm getting the "Machine Check Exception" blue screen. It's always when playing LFS, Oblivion or Bioshock.

My pc:

athlon 64 3700+ (San Diego)
msi k8t neo2 v2.0
2x512mb ddr pc3200
nvidia 7600gt agp
Win XP sp2


P.S. No device is overclocked

have you de_dusted your cpu fan/other bits & pieces? might be overheating.

all temperatures are ok

maybe run memtest86?