What graphics card are you using?
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Hi Mark
My card is a Nvidia GTX 1070 from Gigabyte. I only recently upgraded it in order to support photo editing software.
Charlie
Hi, Charlie. If Windows is crashing, the underlying cause might be hardware or a driver rather than PL5 itself. In particular, I’d like to know what is your power supply and how old is it? What happens if you run a stress test program such as FurMark? (If that test passes, run Prime95 also, at the same time, and see what happens.)
If you run something like HWMonitor, you can see the temperatures and voltages of different parts of your system and make sure they are at the right levels. They should stay at good levels even under stress.
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As Greg suggests, check the driver and power supply and the corresponding data. The 1070 should work fine with PL 5.2.1.
Thank you Greg and Mark
Running the Furmark stress test gives exactly the same symptoms as when DXO DP export runs: the fans go mad and the PC crashes. The Nvidia driver is up to date, 512.59, and the PSU is 750W. I bought the Nvidia card secondhand; do you think that it is faulty? I didn’t have any 8 pin power leads so I bought a 4 pin molex to 8 pin pci-e PCI Express 8 Pin cable to supply the power. At the moment the motherboard and CPU are running at 36-37 C.
Thanks, Charlie
Running HWMonitor indicates that fans are not running on the GPU. The GPU temperature is 47C with hot spot 57C. A dud board?
Just opened the PC case and GPU fans are staionary.
I checked technical data of GTX 1070 and it needs a 8pin connector
(my GTX 1060 has a 6pin connector, btw)
– so that seems to give you the problem of unsufficient power for the GPU
Hi Wolfgang
Yes, but the 2 Molex to single PCIE 8 pin adapter gives me an 8 pin so it does power up OK. I’ve just got the fans running with the MSI Afterburner utility. I am not overclocking at all.
Charlie
It might be that the fans on the 1070 don’t run unless they really need to, to keep the system quiet and power-efficient. I’ve noticed the same with my last two video cards and power supply.
750W should be enough for a 1070, but other aspects of the power supply have to be considered such as maximum load (current) on each power rail and how much voltage you lose under a heavy load. The way you have your video card hooked up might simply not give the card enough current (or a stable enough supply of power) when stressed. It suggests to me that the power supply isn’t designed to run it. Still, you might use a voltmeter in addition to what HWMonitor shows to make sure the rails you’re using aren’t overutilized. You might also try connecting the molex adapter to another rail or see if the power supply can be switched from a multiple rail configuration (each limited to a certain number of amperes) to a single rail configuration (that might support more current for all connected devices). Try at your own risk. 
Thank you Greg
I’ve contacted my PC suppliers and they confirm that my cheap PSU isn’t up to the job. I’ve ordered a more appropriate one and will fit that. The new one comes with multiple PCIE 6+2 connectors so fingers crossed!
It does look lkike it was all my stupid fault; I shall own up if that proves to be correct.
Charlie
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Thank you both Greg and Mark for your help. I contacted Palicomp (PC builders) who confirmed I’d need a better PSU. I ordered a 650W Seasonic which comes with dedicated PCIE socket. It arrived this afternoon (thanks Palicomp for good service), I have fitted it and it runs Furmark correctly (that’s a great little program) and also copes well with a DXO Deep Prime export! I am delighted 
Charlie
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