What resolution are you trying to change it to?
What is the size of your monitor?
It sounds like you're just picking the wrong resolution. I'd start small, and move up gradations, like 800x600, then to 1024x768, and so forth. Also, you can go in to Device Manager (right click My Computer, then click Device Manager), and remove the device from the Display Adapters section, which will allow you to reinstall the driver.
alc6379
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