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This message can appear if you are using a 64 bit version of Microsoft Word with the FaxTalk Fax Merge. By default, Microsoft Office (versions 2010 and higher) install the 32-bit version of Office even if your computer is running a 64-bit edition of Windows. FaxTalk Fax Merge requires a 32 bit version (the default and recommended installation) of Microsoft Word.

http://office.microsoft.com/en-001/word-help/choose-the-32-bit-or-64-bit-version-of-office-HA010369476.aspx

How to check which version of Microsoft Office is installed

http://office.microsoft.com/en-001/excel-help/what-version-of-office-am-i-using-HA101873769.aspx