|You can try to rebuild the Icon Cache file and see if that helps.|
You might also want to try a Repair
Click Control Panel
Click Programs and Features
Select, but do not double click, the Office program
On the task bar at the top of the screen, you should see Change
or both Change and Repair.
If you see only Change click it and the Repair option should be one of the next options.
If you see both Change and Repair, click Repair.
You may need the original install media and/or you may need to restart your computer.