To: Robert Graham
If it's only with THIS program .... nevermind !
BUT, ... did you ever consider your display card defective?
OR, it could also be slightly loose in the socket.
I've seen computers do strange things when either the display card or even power supply are faulty, intermittently.
if it's a desktop unit, and kind of old, dust and normal vibrations can also loosen, or slightly oxidize the power supply connector pins, to the mother-board, making intermittent bad power connections.
(the largest multi-pin thickest cable from the power-supply to the main board)
even my own computer (from 1999 *eyeroll* ) needed some "swaying" of the connector to move the pins, so it could make a better connection to the main boards power socket, then push it back down to re-seat it firmly.
(or even remove the socket, and look to see no oxidation on the pins)
if your computer is from around 2000 to 2003 or 4, it could have a fault caused by defective electrolytic capacitors (counterfeit) that went bad under heavy load and gave the same results of rebooting by itself intermittently.
It was all the talk at water cooler back then, about how someone stole an incomplete formula for a companies electrolytic capacitor, and thought it was finished, so they manufactured hundreds of thousands of them and sold them to the electronics industry. I know someone who had a computer with these caps, and it booted all by itself, without notice.
IF your computer is from back then, you can see the bad caps by looking for the tops of them to be bulged, like it's puffy, and may also be on the bottom with stuff leaking out. What happens, is, the Electrolyte leaks and the internal posts short momentarily, under heavy current and heat, then the current "heals" them, and it starts again when the heat and current pop the electrolyte again. It may have even started to boil :) and the caps would really POP ! open.
If you have a laptop, you could also have a hairline fracture on the main board, or any other critical circuit needed for staying ON, ... making it reboot.
(I've seen a Toshiba laptop doing this, lucky it was still under warranty, the fracture was in-between the boards multi-layers)
-cheers-
-links-
what's ...
... an Electrolytic Capacitor ----> http://en.wikipedia.org/wiki/Electrolytic_capacitor
... Electrolyte -------------------> http://en.wikipedia.org/wiki/Electrolyte
... Vibrations --------------------> http://en.wikipedia.org/wiki/Vibration
... Oxidation ---------------------> http://en.wikipedia.org/wiki/oxidation