Brett928S2 :
Hi
Run a hard drive test in DOS...HIRENS CD etc, it sounds like a failing hard drive...
All the best Brett
It seems like this is the standard answer to everything that is wrong with Windows 8. Disc 100% usage? Bad hard drive. CPU 100% usage? Bad hard drive. Can't access the Windows Store? Sounds like your hard drive. Windows dropping the WiFi connection? Wups! Need to replace your hard drive! It is a lazy, non-thinking, "I don't want to be bothered with your problem" answer. How many new hard drives do I have to buy before Windows 8 no longer causes me a problem? Once, just once, can someone consider the problem may be Windows 8 before blaming something else?
I had the same problem. I solved it by uninstalling Norton Internet Security. NIS worked just fine under Windows 7, but it gave me nothing but grief under Windows 8. You wouldn't believe how many "experts" said it was my hard drive. They were so convinced that they refused even to believe the diagnostics.