Hello Anu,
It is possible that there are corrupted data files on the system that affected your Office apps. To isolate this issue, we suggest that you perform an online repair via Control Panel. Kindly follow the instructions found on this
link. Once done, check if you will still experience the same issue. If so, use easy fix tool to completely uninstall Office. To do it, follow the instructions under Running Repair didn't help. Now what? on the same
link. Then,
reinstall Office.
Hope this information helps. In case you need further assistance, kindly reply to us.