I am working on a Sony Vaio desktop with a TFT flat screen monitor and XP. The screen was only displaying 800x600 size letters. When a larger resolution was requested, the monitor issued an error message: Out of Scan range and the screen stayed black. I attached a CRT monitor and was able to see the screen. I downloaded the latest driver, and it said it installed successfully. But the Device Manager doesn't list any display adapters, and I still cannot change the resolution. It is 800x600 with 16 bit colors. The properties of the driver, (Display - Settings- Advanced - Adapter - Properties) lists VGASAVE. There is not option to make changes. There is not information on the video card; it says Unavailable.
In Device Manager, there was a yellow exclamation point next to VGA Display Controller. I deleted it, and rebooted. The found new hardware message appears, then an error message: Unable to load new hardware.