can't display above 640x480

I'm trying to fix a PC that can't get the display above 640x480.
The monitor is a viewsonic VE510b, which is listed 3 times under
Monitor in the hardware list, and the display Adapters listed are Inet
82915G/GV/910GL Express Chipset Family, listed twice.
I've tried clicking on Update driver on all these, and it can't find
any better versions.
When I do a windows update, it lists a driver for the monitor, but the
update fails, with no reason given as to why.
I can attempt to set the resolution up to 1024x700, but nothing
changes, it just reverts back to 640.
What should I look into at this point, replacing the video adapter?

.

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