It is possible you have corruption, but will not hurt to try and run the installer again. It may be smart to actually remove the program and then re-install.
1. Go to the Control Panel or Programs and Features or Remove programs (depending upon the windows OS). 2. Locate the program called Office and remove. 3. Then click the link I have provided and run the Full Install again. 4. Restart windows 5. Then start testing again.