Windows taskbar flickering, screen randomly freezing, more CPU usage than expected

L

Le Nhat Thong

Recently, my taskbar flickered (video below), I tried many ways to fix it but nothing seems to work, I tried reinstalling windows 10, 11 multiple times (Education, Pro, Home, etc...) But my taskbar and errors are still there. I tried updating BIOS, graphics driver from the manufacture's website. Whilst the taskbar flickering, my screen'll also randomly freezing 3-5 seconds which makes my laptop unusable. Last but not least, my cpu usage while gaming is higher than expected (the game only runs at 30%-40%, nothing else is running but the cpu usage in task manager shows 90-100%)My laptop: DELL In

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