how do i fix this problem

[Kuro LSN]

my laptops battery doesn't work and while i was using the laptop the electricity got cut for a moment and after i turned it on again the windows and all the programs and games fell heavy and have low fps i tried to fix all the errors and warnings in the event log and even reinstalled the integrated NVidia graphics card driver but nothing worked my i laptop is dell Latitude E6430 with dual graphics card

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