So, you own a brand new Toshiba Tecra S11-128 laptop with Win7 64bit, and it crashes happily.
Mine liked to crash when opening a youtube video, or when something happened on the audio output. Earlier on there was a problem on the network card driver, that was apparently solved with a driver update (available through official channels and offered by Toshiba's software onboard).
Driver patches for the soundcard were not available. Instead there was a BIOS update to be applied. Follow carefully instructions and you'll probably solve this BSOD cause. It's all on Toshiba website.