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After installing Microsoft Office Web Apps on a SharePoint 2010 server, I got an error when displaying a word (*.docx) file:

Error
An unexpected error has occurred.

Troubleshoot issues with Microsoft SharePoint Foundation.

Correlation ID: 848a2b82-a1a4-4faf-895e-1451464fa3b0

Date and Time: 3/10/2010 8:18:03 AM

After activating the Microsoft Office Web Apps feature on the site collection:

this error was resolved and Microsoft Office Word online started to show, but with a new error:

Word Web App cannot open this document for viewing due to an unexpected error.  To view this document, open it in Microsoft Word.
Error Id: 557be21f-f14d-4c76-9be5-d07f2a04b8f9, 20100310083103

This was because you need some additional steps when installing Microsoft Office Web App on a DC, see:

http://sharepoint2010blog.blogspot.com/2010/01/error-in-office-web-apps-when.html

But the error was not resolved:

Word Web App cannot open this document for viewing due to an unexpected error.  To view this document, open it in Microsoft Word.
Error Id: 3b5ec400-4f95-495b-b663-320b9b9692be, 20100310124900

Followed the steps on:

http://blogs.msdn.com/opal/archive/2009/11/16/installation-notice-for-sharepoint-2010-public-beta.aspx

Followed the steps on:

http://dirkvandenberghe.com/archive/2009/12/25/sharepoint-2010-office-web-apps-on-a-single-server-sharepoint-foundation-gt-issues-and-fixes.aspx

Followed the steps on:

http://blah.winsmarts.com/2009-11-SharePoint_2010_Development_Environment_-and-ndash;_Practical_Tips.aspx

But the error still was not resolved, I am know rebuilding my server and starting from scratch, following the guide:
http://blogs.architectingconnectedsystems.com/blogs/cjg/archive/2009/11/28/SharePoint-2010-_2D00_-Step-by-Step-Install.aspx