my laptop start and shut down

[Mirza Nemath Ali Baig]

When I tried to start the laptop Lenovo z570 after few seconds showing the startup screen and shuts down and it do this again and again repeatedly I have tried removing battery and bios battery everything I have tried what's the problem I do not understand

 

[williamjames07]

it will cause due to virus in your syatem thats why face this problem.