It's something that can fixed after the install more easily than with the LiveDVD. It's definitely fixable.
First thing to check for is to make sure you are running the proprietary nVidia drivers.
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# eselect opengl list
If that doesn't say nvidia, then you'll need to install the drivers.
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# equo install nvidia-drivers
Then go back and make sure nvidia is selected:
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# eselect opengl set nvidia
reboot. There is a nvidia settings GUI that will let you change the resolution easily if it isn't working correctly at that point.