|Try looking in the AutoCorrect Options to see if the capitalized version is stored there.|
I don't have 2007, but in 2010 it's File...Options...Proofing...AutoCorrect Options
In the Replace field start typing one of the words that AutoCorrects to capitalized and see if it appears in the left hand column with it's capitalized version in the right hand column.
If it does, select it and click Delete.
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