Nvidia driver can't be installed. Under normal circumstances, the old driver can be uninstalled and cleaned, and can be installed without restarting the system. If you can't install the driver, you can check whether the auxiliary power cord of the graphics card is connected properly. For example, GTX740 video cards above the game level need an external power cable; If the power supply is insufficient, the graphics card driver cannot be installed. The solution is to connect the power cord of the graphics card, as shown in the following figure:

If you have a graphics card driver before, you need to uninstall the previous graphics card driver after replacement and then reinstall it. You can uninstall the graphics driver through Device Manager:

Restart the computer after uninstalling, enter the system normally, and then update the graphics card driver according to the steps; Windows7 system updates graphics driver. First, open Computer Management-Device Manager-Display Adapter and click "Update Driver Software".

You can also select "Automatically search for updated driver software";

If the graphics card driver can't be installed after the above investigation, if it still can't be installed after the investigation, it is determined that the graphics card is in contact or its own graphics card is faulty; If the hardware of the graphics card is damaged, it is recommended to contact the merchant to replace the new graphics card.