I have a dual-boot PC with vista 64-bit and XP. The problems only occur in Vista, which lead me to believe it's not a hardware issue. Only started last day or so. Running off vista, the PC will die before everything has even loaded up after turn-on. No shut-down or log-off, just turns itself off to black screen. Can load into Safe Mode and seems to be more stable (doesn't crash on it's own accord). Ran MalwareBytes successfully and removed a couple of bits. However both ComboFix and SuperAntiSpyware crash vista during a scan, even in safe mode. Anyone got any ideas?