Doesn't any error appear?
Has it been doing this for a long time or the problem just appeared... If it's something recent try a System restore...
Also does it do the same in Safe mode, or go to start run >msconfig check the load basic devices and ok . Then restart. Does it do the same?
If you are using your computer in those 10-15 minutes , and THEN it turns off it might be a fan issue... install Speedfan and check the temperatures.