Built a pc ground up. Has an Asus z170-ar motherboard with an i5 6600k 3.5ghz 4 core with a coolermaster cooling fan. Has 2 8gb ripjaw ram sticks. Has a nvidia GeForce gtx 1050 to graphics card. Has 1tb hdd. Got it all hooked together loaded windows 7 home 64 bit onto it. Loaded both graphics card and mother board disks up. Installed Windows updates. Yet it is still sluggish. What have I missed or not done