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Try a restart in safe mode and see if it still does it. You may need to reinstall OS eventualy so try to make a backup if you can.
Is it possible your keyboard setting is for a different language? Go to System Preferences / Language and Text, and click on Input Sources. See what languge is checked.
It sounds like your machine thinks the option/alt key is being depressed when that is not the case. This may well indicate that your keyboard is damaged and needs repair or replacement. Try a usb or wireless keyboard to verify.
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