Modern motherboards allow you to disable individual Ethernet ports in the BIOS. If the "Top" port was accidentally turned off, Windows will throw a System Error.
If you recently overclocked or changed memory timings, the PCIe bus might be unstable.
If the hardware is fine but the system reports an error: how to fix system error rg45 top
Corrupted drivers are the #1 cause of persistent system errors.
A. Automatic Update:
B. Manual Reinstall (Most Effective):
C. Roll Back (if error started after a Windows Update): Modern motherboards allow you to disable individual Ethernet
Plug the cable into the RG45 Top port. Look at the LED lights next to the port.
If you started experiencing System Error RG45 after making changes to your system, restoring your computer to a previous state might resolve the issue. B. Manual Reinstall (Most Effective):
This resets the microcontroller on the network card.