turning off and on

Hi, my PC has been acting sluggish the past few months and it's only gotten worse. I re-upped my Avast subscription to help clean up the clutter and optimize it. So after that I was having trouble closing the few windows I had up (Chrome tab, Powerpoint, and Notepad) and decided I'd restart it...

CPU: Intel Broadwell-E i7 6800K (OC 4.0Ghz @ 1.275v) Cooler: Be Quiet! Dark Rock 3 MOBO: Asus X99 AII GPU: MSI GTX 1080 8GB X Edition RAM: Corsair Vengeance LPX 2666MHZ Dual Channel 4x4GB 16GB kit PSU: Corsair RM 850X SDD: Samsung 850 EVO 250GB & 1TB OS: Windows 10 Home Premium 64Bit Monitor...