I will try that, I updated bios a few months ago, it is possible it is just a coincidence that I was exporting a file when the BSoD occurred, My system is the first graphics focused machine I have had so it bit of a mashup of parts, I am running a HP z220 work station with 32GB ram intel i7-3770 & dual Nvidia GeForce GT 710. This is one of the first times actually loading the machine properly as I just upgraded from an older Dell gaming rig,(same time as I updated bios) I had some stability issues where the machine would complete crash & BSoD randomly when I first got it, do you think they may be related? Thank for the advice though.