Application fails with error: 80040154 when attempting to open a doc in Word 2010.

I have a VB.Net app that uses word to open documents. I am running VS 2008 on my PC with Office 2003. When I build the exe and transfer it over to a PC running Windows 7 and Office 2010 I get the 80040154 error - Retrieveing the COM class factory for component with CLSID {000209FF-0000-0000=c000-000000000000046 } failed due to the following error: 80040154....