I have been running Win 8.1 for some time now and it has been working fine, but recently, my laptop refuses to get anything done, booting up takes nearly an hour and when it is fully booted, I am not able to run most programs. Checking the task manager shows my disk usage at 100% with no drops. Yet none of the programs running show this kind of usage. I would like some help as this has rendered the computer unusable.