I'm running windows 8.1 on a fairly new laptop and up until yesterday it has been running fine. Yesterday everything started to slow down and now it runs too slow to do much on. I can't figure out what's causing the problem and I've tried many different things to fix it including scanning for viruses, scanning and fixing corrupt registries, troubleshooting windows as well as hardware and devices, defragmenting, checking for updates for windows and software, and restarting the computer a bunch of times. I checked the task manager and it seems that every once in a while the disk usage will be at 100% but it runs slow even when this is not happening. I would appreciate any help or suggestions on how to find and fix this problem.