That's curious since .doc is the default file type for Word documents.
I would first look in Control Panel, default programs, then pick the
associate file types option then scan the list for .doc and see what
Vista is currently set to use to open .doc files.
I have a REALLY old version of Office, vintage 1997. I just opened it
up and wrote a test document. Both it and Notepad open and display it
without problems.
Try this:
Start, Search, then for the search term type .doc and you'll shortly
get a list of all the .doc files on your computer. See if you can open
any directly from Search, that at least willsee if there are other
misconfigurations issues.
If all else fails,
http://www.microsoft.com/downloads/...87-8732-48D5-8689-AB826E7B8FDF&displaylang=en
or search for a similar viewer or just reinstall word or whatever you
used to create them.