Remember that Skyrim itself cannot DIRECTLY cause a blue screen or system crash. It only passes commands and data to the drivers that handle everything. True bugs merely kick out out ( CTD's or Crashes to Desktop ). The OS and drivers should properly handle bad calls, etc. without crashing. If your system crashes, look to a hardware issue. I've found that Skyrim puts a lot of load on the CPU. I've used it to find hardware problems on a couple of laptops, that would do exactly as you've said only when running Skyrim. In each case it has turned out that overheating was to blame, in once case the video chipset, in another the CPU and in a third RAM was getting too hot due to the exhaust from the CPU and video coolers.