Microsoft office word not installed for current...

Question

When I try to open Word/Excel/Microsoft Outloofk or Power Point the following window opens within the document
"MICROSOFT OFFICE WORD HAS NOT BEEN INSTALLED FOR THE CURRENT USER. PLEASE RUN SETUP TO INSTALL APPLICATION'
I have uninstalled and installed Office twice and problem still exists. I called Microsoft, unable to help. I am the only person to use the computer. This happened all of a sudded about a week ago. PLEASE someone help me. Robyn