Russkly
It is very difficult for me understand inglish. When you say:
"(delayed when a Firefox-inspired System Restore screwed up Steam so that I couldn't get into CoD!)"
You meant that you make sistem restore?
If this is correct, then please, make a graphic card log (gpu-z is good) and check clocks too.
Before the blue screen problem solution, i did a restore sistem.
I'm not very sure even the problem is the temperature, then i repeated again the test, and the surprise was that when prior to the restore, the graphics card was everything 100%, then now it does not exceed 60% (before flying with all the options middle, 100% graphic card working, and after, witch all options to full without loss of fps's or stutters increased after 1 minute).
I think there is something that escapes us. Visor events have launcher and net 4.0 errors even. The difference is that now i don´t have reboots or blue screens
Thanks Russkly