I think there's no such thing as an uncrashable OS. I was introduced to RedHat with, 'We need to use the memory for zillions of calculations, not waste half of it on the OS, and BTW you can't crash it', and I'd managed to crash it within four days :)

I crash the browser all the time, not Windows itself so much. elerrina_amanya has it crash on her more, I think, that's why she'd like a different OS.