Hi, I own an MS SPro 128GB that I used to use regularly. I had the auto-update option turned on & I updated the OS to Win 8.1. Don't know exactly when this happened, but the SPro has become so slow that it's practically unusable: I checked the Task Mgr to figure out what it's doing but it shows that the CPU is idle 95+% of the time. Just can't figure out why my touches or keystrokes take so long (minutes!) to get acted on. The SPro faithfully stacks all my keystrokes and acts on them in sequence but it takes so horribly long that the machine has become unusable. Any clues on how I can fix this problem will be greatly appreciated. Posting this because I couldn't find any similar problems either in the FAQ or archives. Thanks in advance for your help!