Further update - I had to update the sound card driver by downloading the latest one from the Manufacturer's website then installing it from my PC. The button on the Device Manager tab called "Update driver" for the sound card didn't install the driver correctly (or maybe didn't install the correct driver), brought up a couple of error messages and caused the crash. Using the same method for the graphics card driver worked OK though.....
I won't be making that mistake again. Probably.