The new work laptop received a few months ago had Windows preinstalled. I never got around to uninstalling it and moving to my standard Ubuntu setup. But then last week a whole series of mishaps happened starting from a conversation with a colleague where I shared my desktop with him via Skype.
Type "bsod skype windows" in google and you'll see this. In other words, Skype's more interesting features simply are not compatible with Windows.
Recovering from that scenario was next to impossible. There was some environment variable I had to unset somewhere, but my laptop would start up and then, after about 4 seconds, would shut down again, after which it would restart automatically, and then crash again 4 seconds later.
There were various random pieces of advice about what to do, i.e., go into some internal bios menu or other, which only messed things up worse in the end.