I upgraded to windows 10, but for some reason a large amount of my ram is being used as well. I start up my pc at 70% some times. I have 8gb of ram. Also, if i were to downgrade back to 8.1, would the ram still get consumed as much? Regedit, going to NDU and then to start and changing it to 4 doesn t seem that it worked. If i downgrade to windows 8.1 and see that it doesn't work, can i re-upgrade to 10?