Blue Screen with Torque [SOLVED]

Prior to getting Torque 3D, my PC had never blue screened (about 3 years old). Since I've installed Torque, it's happening regularly - but only if I have used Torque since reboot (i.e. if I use the PC for absolutely anything else, it will run for many hours without a problem).

It's now happened enough to be sure it is Torque related. It appears running any of the World or Gui editor, or playing the game is enough to put the machine at risk. I don't know if simply opening the Toolbox is enough (because I never do that without going on to do something else as well).

I can shut down all the Torque stuff after running it, but the machine is still at risk. Once I have run something from Torque I probably have somewhere between 5 mins to 2 hours before it will blue screen (I have never managed to keep the machine running longer than that). There is no obvious user action trigger that finally causes the blue screen - each time it has happened I have been doing something different - often not even in a Torque application at the time.

The inference is that running Torque invokes something which then remains active until the next reboot. I don't know how to interpret the blue screen information, so maybe it contains a clue.

Does anyone else have this problem? More importantly, any suggestions how to stop it happening?