After upgrade to OS 4, my 3GS display twice normal size

I installed iTunes 9.2 and downloaded OS 4.0 for my 3GS, then installed it. Now I can't use the phone because the 3GS display is apparently the wrong resolution for the new OS. I can see only the centre half of the screen. How do I fix this?
Lee
[email protected]

Double-tap using three fingers to un-zoom, and then go to Settings -> General -> Accessibility -> Zoom and tap the Zoom On/Off switch.
If you have trouble with that. connect to iTunes and click the "Configure Universal Access" button in the Summary pane and turn off Zoom there.
http://www.apple.com/iphone/how-to/index.html#accessibility.accessibility-featur es

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