Thanks for the advice.
I ran the memtest, found no errors. I then ran the HDD test, found some errors, so I repaired them.
I am not sure how to update those drivers
you mention. I tried googling them but couldnt find anything relevant.
I dont know if the hdd was the problem, I havent had the blue screen yet, but I will test Paint, dwg files and pdf's which seem to trigger it.
I have also noticed that I randomly get the screen flickering, then back to normal, with an error message saying that the Display Driver
stopped working, but then was restored. Not sure if this is anything to do with the BSOD.
Would updating the BIOS be worth doing? And how would I do that.