1.8.2-pre5 crashed my pc?!

When I load up my SP world and start looking around, it looked very weird. It looked like I was walking close to y=0 (screenshot). After a couple of seconds my pc froze. I got a BSOD with this message: DPC_WATCHDOG_VIOLANTION. I didn't had this message before, but my pc froze a few times the last weeks.

So i'm not sure if this is caused by minecraft or something else.
Sorry for my bad English