Blue screen Help

Hi guys, today my hp dv6 laptop restart automatically and when it finished rebooting it show me a message that my pc was rebooted to prevent an unexpected shutdown and the log can be found in minidump folder. I have uploaded the minidump file and add the url here. Can anybody help me recognize what was the reason of blue screen? (Sorry if I post this thread in wrong section.)

The link: http://www.mediafire.com/?vyakhztt9lp1uwb

Thanks in advance.