Answer:
1. Reboot computer
.
2. If the issue persists, check if antivirus software is updated; if so, then verify if the problem is only with Office suite, try to save another Word, Excel, Power Point document and running other programs. If the problem is also extended to Excel or Power Point and other programs run properly then:
a. Uninstall Office Suite (documents and information won´t be lost)
b. Reinstall Office Suite
c. Run Word, Excel, etc.
Word documents should open properly.
Explanation:
The above procedure should solve the problem given that it was verified and discarded that the malfunction was caused by a virus and upon verifying that the problem was not only with Word, but all applications related to Office Suite, then by reinstalling the software any malfunction could be fixed.