you will need to download the driver file, if you know your modem type, google should be able to find it easily. You can do this from another computer and copy via usb drive, or by plugging a lan cable into your computer (assuming your computer supports this). Wireless is the only type of internet that may not work by default.
If you click on the lock icon in the bottom right it should attempt to find updates and drivers for you, simply let it install them, once your new video drivers are downloaded you should be able to change your resolution.
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