windows 10 stutters

hi, first I want to tell you my specs i5 2500 1050ti 8x2 1600mhz ddr3 z68ap-d3 (couldint update it) 650w power supply liquid cooling 2tb Seagate barracuda ok, my problem is : 1: the ethernet speed unstable (goes up then goes down) so that affect the download speed 2: when I use HD...