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I can't stand it, please help me! The network card driver has no digital signature, which causes the computer to restart frequently.
Download Everest hardware detection software, check the model of your network card, find a matching network card driver, or buy a new network card to use.

I'm not sure. I suggest you borrow a network card and disable it for the current network card. It may also be caused by unstable power supply voltage. Let's see if the CPU fan is dirty first. If there is too much dust, the computer will not work well.