Help please , hardware monitor found error

Question

hey hows it going ? wondering if ya help me out ? here's my problem!
i go to burn a dvd useing nero 7. starts to encode the movie for about 5 mins. then the computer shuts off and restarts and brings me to a promt screen telling me there has been hardware monitor error press f1 to countiue. i press f1 to bypass this and the computer starts fine. this only happens when i try burning a movie ??????? any help will be greatly app. thank you. o not sure if this helps you or not , my computer i built myself
and just re did windows ?