I have a Lenovo Edge E430 with an i5 cpu and 4gb of Ram. I upgraded from windows 8 to Wincows 8.1. Since the upgrade my laptop is running extremely slow. I notice that the disk utilization jumps up to 100% frequently. I see that Service Host: Local System (Network Restricted is eating up a lot of the Disk through task manager. I haven't installed anything since the upgrade. I ran spybot and all it found was some cookies that were removed. Any Ideas? Suggestions?