Outlook Express does not have spell check of it's own. It uses the spell check from Microsoft Office apps or Microsoft Works (if it had Word with it).
Do you have either of these programs installed? If you do, then you may have a missing file Csapi3t1.dll you need to reinstall.
If you don't, there are some other spell check programs you can install that will work with Outlook Express.
I have outlook express as my default mail system. I can't for the life of me fiqure out how to turn on the spell checker to check the spelling when I go to send. The spell check icon does not appear in the tool bar and it shows up as lite grey and nothing happens when I click on it when I look to manually check the spelling. What am I doing wrong? Please help guys n gals. Thanks in advance.