Aspire E1-571 Games stuttering, FPS drops and lagging

Latoptop specs:

Graphics:

Intel HD 4000.

Hi everyone,

The problem is, i upgraded my laptop to windows 10 from Windows 7. Installed updates and everything, but when i play games, the game starts freezing, FPS drops, and starts stuttering. Even GTA San Andreas worked perfectly, at 80-90 FPS with ENB series, now i am getting 60-40 FPS, depending on the location. But when i play SA-MP, it sometimes starts lagging as hell, i played GTA IV, 60-70 FPS, now the GTA IV lags as hell, i used to play War-face, 50-65 FPS, now it lags as hell. I thought the games lags because of over-heating, i bought the extra fan for it, whenever i play any games, the laptop doesn't gets hot, it doesn't over-heats.

Any help would be appreciated.

Thank you!