|No error messages?|
No sure 2010 has a Diagnostic, but try this:
Running Microsoft Office Diagnostics from within Excel/Word
Click the Microsoft Office button (File button on 2010)
Click on the Excel/Word Options button to bring up the Excel/Word 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
If you do not have a Diagnostic try do a repair.
Select Control Panel
Select Uninstall Program
Scroll down to either Microsoft Office or Word, which ever you have.
Select, but do not double click,
at the top of the list, two options should appear Uninstall & Change
Click on the Change button,
In the next window select Repair.
You may need your original install media.