Connected laptop to overhead projector - now my desktop/etc is large, fuzzy

Hi all,
I connected my laptop to a VGA (?) cable to give a presentation. I noticed that as soon as it connected, my display got much wider, the fonts bigger, etc, but didn't pay any attention to it.
Now my computer won't go back to normal, however. I have already fixed the resolution in System Preferences - now the desktop photo looks normal, but everything else is still BIGGER. Save me from my third grade-looking laptop! What can I do?
A PC friend muttered something about a video card being the culprit - does that make any sense?

Already did that - but it's not just the icons. For example, even the Apple icon that appears when you sign in is bigger. So is Microsoft Word (I can't even see my formatting bars). So is the writing across the top of the Firefox browser (even though I adjusted the font of the content). Etc. Etc.
Something is amiss! I can't figure our what happened.

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• Save to Memory stick and Playback on PlayStation 3
Yours Bengt W

Connected laptop to overhead projector - now my desktop/etc is large, fuzzy

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