This fix completely stabilised the running of Cubase 8 Pro on my computer.
I changed the SATA ( Hard Disk ) controllers on the machine from IDE to AHCI via the machines BIOS.
Cubase 8 Pro now runs very smoothly on the computer.
I followed these instructions on how to change SATA controllers from IDE to AHCI : http://www.neowin.net/news/neowin-guide-how-to-change-from-ide-to-ahci-without-reinstalling-windows
Hope this helps any one who has had the same issue.