Thank's for all your help kemical, I'm now going to hand my PC over to one of my techno savvy friends to try and fix. Failing that, the PC is going in the bin because as you have no doubt figured out, its getting pretty old. . . Thank's again, best info ever.
My PC on Windows 10 since its launch has started to crash within the last week with a " Unexpected Store Exception" error message. All updates are on automatic and I have never had this problem before.