I was getting blue screens of death on average about twice a day. Worst of it was that my computer wouldn't restart afterwards. It would restart eventually but I had to turn it on and off about eight times. As part of my desperate attempts to figure out what was going on, I switched from FF to Chrome. No blue screens since then.
I'm still not sure what caused them. I eventually got Windows debugger up and working but apparently Windows in its wisdom deleted my dump files. Apparently to get Windows debugger you need to download a DVD image, burn to DVD, then install the debugging kit from the DVD. I had already wasted all my blank DVDs in an equally desperate attempt to run Windows backup, which failed every time with mysterious messages about reparse points. I have yet to find a comprehensible discussion of why I have reparse points and why backup doesn't like them. They seem to be some sort of fancy variant on links to directories, which should be pretty harmless.