start up setting windows 7 driver signature

How to check the serial port of a device on Windows?

A message is displayed indicating that the pre-installation fails when I install the driver. The Windows Device Manager does not show the Port (Other device) option. After installing the CH340 driver on Windows 7 (not activated), I cannot see the corresponding serial port on Device Manager. The Windows 7 system displays a message indicating that the driver is installed, but the driver is shown with an exclamation mark on Device Manager and the serial port cannot be connected. mBlock 5 cannot identify the serial port after a device is connected to the computer.

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Start up setting windows 7 driver signature