Question ILaptop becomes lag!

Jun 25, 2019
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samsung rv413
240gb kingston ssd (bnew)
4gb ram 2x2gb
actually it becomes laggy just recently the task manager says that my CPU usage “almost” always at 100 percent while my ram reaches over 2gb even when “almost” no application is actually opened.
the unit is lag even freshly formatted
tried variety of O.S but nothing works., hope someone might know what's the real problem here.