Win8 system win8 system prompts can not verify winloader digital certificate

If you restart the computer after reinstalling the win7 system, then the old method, first restart the computer, check if there is a prompt to verify the winloader digital certificate. If not, the fault is removed.
But if the fault persists, I suggest you buy a Windows system installation CD, insert the CD into the driver disk, then restart the computer, then repair the computer after the computer restarts, a window will pop up. Select "Repair Computer" on the window, select the repair tool, and the prompt will not appear when you check the computer restart after the repair is completed. Or restart the computer, then press and hold the F8 key, then select the “Advanced Startup Options--Last Good Configuration” on the pop-up window, so the computer will restart automatically, and you can fix the fault now.