The realtek ethernet controller driver is the software driver for the realtek ethernet cards. it is a program used to communicate from the windows pc os to the device. this software is required in most cases for the hardware device to function properly.. The realtek ethernet controller driver is the software driver for the realtek ethernet cards. it is a program used to communicate from the windows pc os to the device. this software is required in most cases for the hardware device to function properly.. Intel
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