Well you can deploy Word Viewer from the exe by passing the /quiet /norestart command line parameters. If you really want to deploy the extracted MSI file then make certain that you check the "Include Entire Directory" checkbox. This is necessary because an extracted Word Viewer contains multiple files that the MSI will need during deployment.

If you use only the original exe (wordview_en-us.exe) without extracting it then you do not need to check the "Include entire directory checkbox"

I deployed using both methods successfully. Let us know if you still run into problems.