You have Office Web Apps 2010 installed, Word and PowerPoint viewing does not work, but the editing does.
The appserverhost.exe process is crashing on startup, with error:
"There was no endpoint listening at net.pipe://127.0.0.1/e31bfd4c-5d98-4dc3-8232-5d2601ca814d that could accept the message. This is often caused by an incorrect address or SOAP action...."
The SharePoint third party workflow product Nintex cause this issue.
Stopping all Nintex Windows services on the SharePoint server that runs the Word Conversion Service.