|Have you tried a Diagnostic?|
Running Microsoft Office Diagnostics from within Excel & Word
Click the Microsoft Office button
Click on the Excel/Word Options button to bring up the Excel Options dialog box (at the bottom of window)
Click on the Resources button in the left hand pane
Click on the Diagnose button in the right hand pane
Click Run Diagnostics
See what that shows.
Also, you can check some spelling options:
Click Review tab
In the Proofing Section
Select Set Language
Is the box unchecked next to the "Do not check spelling or grammar"?
Click Office Button
Select Word Options at bottom of window
Make sure the box is checked next to "Check spelling as you type"
Make sure the box is checked next to "Use Contextual Spelling"
Make sure the box is unchecked next to "Hide spelling errors in this document only"
Make sure the box is unchecked next to "Hide grammar errors in this document only"