screen flickering again and again when mouse pointer touches the things.please help to solve it.
Hardware details ?
Intel(R) Core™ i3-7020U CPU @ 2.30GHz (4 threads, 2.30GHz)
Try openfyde / fydeos (use rpi imager).
Do check virtualizations options on bios
Also enable ahci on bios
Disable your nvidia with hwtuner (its probably that).