Fixing Microsoft Office Word 2007 2003 – spell checker not working.
When typing in misspelled words, spell checker does not underline the incorrect word. When selecting spell check from menu, it could not find any misspelled words. This applies to both new and existing documents.

smallwei 7:57 am on October 16, 2009
Your office profile might be corrupted. Try this following soluton:
You need to make some changes in your Windows registry in order to fix the issue:
1. HKEY_CURRENT_USER\Software\Microsoft\Shared Tools\Proofing Tools\1.0
AND/OR
2. HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\ApplicationName(Word, Outlook, Exel, etc.)
Rename these keys by going to Start->Run, regedit, in registry editor navigate to the following keys and rename (right click) them to:
1. HKEY_CURRENT_USER\Software\Microsoft\Shared Tools\Proofing Tools\1.0old
2. HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlookold (example for Outlook spell check) OR HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Wordold (for Word spell check)
Reboot Windows and restart Office. MS Office will recreate the keys automatically.
Notes: Creating a new profile does the same thing. If your spell check works under a new profile, your current_user registry is corrupted, and this fix should work fine.