Prompt : "Office Error"

Recently I upgraded to version 2.2.00.19 and all was just fine, when one day I got the following prompt : "Microsoft Office This application must be installed to run. Please run Setup from the location where you originally installed th application." Intellicad refused to run. I tried to install Intellicad, Office, but to no avail. Finally I had to install WINDOWS for intellicad to run. Anybody knows which dll file was corrupted ? and if I had another option to overcome the problem ?