here is the screen short
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Thanks guys for your replies. I tried clean boot but it didn't work , still 100% usage. I just find out that if i hit my laptop (lightly) , my disk usage starts to drop but after few sec it starts...

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...