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When TntMPD fails to connect to MS Word to automate a mail merge, it's usually one of two things. Either Word is not installed or running correctly. Or there's an anti-virus program putting itself in the way to prevent what it thinks is malicious software doing things it shouldn't do.
First, read this article by Microsoft:http://support.microsoft.com/kb/246018
This link shows how to diagnose your installation of Office (including Word):http://www.howtogeek.com/howto/microsoft-office/detect-and-repair-applications-in-microsoft-office-2007/
A restart of your computer might be helpful, also. And if you have an anti-virus program, try turning it off temporarily to see if that's the culprit.
Until you get this fixed, you may need to manually perform a mail merge:http://www.tntware.com/tntmpd/faqs/en/how-can-i-manually-perform-a-mail-merge.aspx