Hi, and thanks for using JustAnswer.com.
Please try this first: click Start->All programs->Accessories->System Tools->System Restore and restore the computer to any date before this issue has occurred.
If that does not work, please go to Control Panel, and uninstall it (since the repair option did not work), then restart the computer and reinstall it. Removing/reinstalling the program does not affect your documents/data files. (If you do not have the office disk, you can click here to download).
Please let me know. Thank you.