To convert Wordperfect files for example, first select the MS Word conversion method. Now, be sure that MS Word is installed and that you can open the file type you want to convert within MS Word.
Typically WordPerfect cannot immediately open within MS Word without first installing the necessary file filter. You can remedy this problem by simply opening up the document type in question within Word. Word will prompt you to install the necessary module. Also, you can run the installation for MS Office and add the necessary file filters for MS Word. During installation, be sure to check the "Converters and Filters\Text Converters" for all required filters.