I have lenovo g480 with 750gb hdd and 6gb ram. when i installed y windows 10 it worked fine for me for 4 months but now its lagging due to 100% diskactive time. i tried disabling superfetch, windows search, BTS , notifications , antivirus , chrome and skype pre-fetching but nothing worked for me. Then i run smart test of hdd it was also fine. what should i do now ??? plz help.