Don't know if this is any use but found this quote when trying to find the nb100's native reolution:
"A bizarre option is included when pressing Fn+ESC, which for some reason dumps the screen to 800x600, a significant drop from the native 1,024x600. We're at a loss as to why it even exists. The screen is also capable of enabling resolutions of up to 1,920x1,080, but anything above 1,024x600 will result in you requiring to scroll the screen using the mouse. It's a nice work-around though for those applications that haven't been designed to take the netbook's low resolution screen into account, including the bundled Norton Internet Security (NIS), with the first pop up already beyond the limits of usable screen real estate."
So the netbook's native resolution is 1024x600. If for some reason it's not using the correct display adapter driver, that resolution may not be available?