After installing the WP8.0 SDK the display driver kept crashing and I kept getting various BSODs related to the video card. The most frequent one was VIDEO_TDR_FAILURE in nvlddmkm.sys. This was completely unrelated to development work - for what's it worth, it never happened while debugging.
I was running nVidia's latest drivers (306.97) and I tried reinstalling that and other versions. I even tried the beta versions, but that didn't help.
The only thing that helped was disabling virtualization in BIOS, but this killed Hyper-V and the emulators. The motherboard is an Asrock 970 Extreme3 and the processor is an AMD FX-4100 w/ 8GB RAM - did anybody encounter any similar issues?