It is likely that the words not being checked are formatted for no proofing.

Open one of the documents and press Shift-F1. Then click on one of the
misspelled words. Word will display the formatting applied to that Word (and
the source of the formatting).

If it says "no proofing" or "do not check spelling and grammar" you need to
modify the language setting. Select your entire document (Ctrl-A) and use
Tools Language to change the setting.
--
Charles Kenyon

Word New User FAQ & Web Directory: http://addbalance.com/word

Intermediate User's Guide to Microsoft Word (supplemented version of
Microsoft's Legal Users' Guide) http://addbalance.com/usersguide

See also the MVP FAQ: http://www.mvps.org/word which is awesome!
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from my ignorance and your wisdom.

"help im a student S.A. 's to wright?!" help im a student S.A. 's to
wrote in message
...
when i type a word i know is spelt incorrectly my computer does not
underline
it in red or grenn, i have turned off all the setting that you do to turn
spelling and grammar check off and i have turned it back on agian and it
still doesnt work, please one of you brainey people help me i have lost of
essays to right for my exams and i keep missing all the typing errors i
make.