THis error is really quite bizaar, but surprisingly, the printer seemed to be
the issue.
Here is my situation and "work around" resolution:
I am using MS office 2007 with Vista.
about 40-50% of the time, the error occurs when attempting to open word, but
only about 20% of the time w/other office programs (e.g. powerpoint and
excel).
Anotherwords, when the error occurs with Word, it often does NOT occur
w/another Office app, so I CAN usually open an excell file ven when word does
not open...
Further, when I drill down through program files and attempt to open the
winword executable, it still does not come up (although I don't get any
visable errors doing this).
So... after reading through all the posts, I went into control
panel/printers, and changed my default printer from my Brother network
printer to Microsoft XPS Document writer.
After doing that, word opened normally!
I then immediately went back to control panel/printers and changed the
default printer back to my brother network printer.
Word, and other office apps continued to work (open) normally.
and FYI, they were also able to print normally using my brother network
printer.
Later, the intermitent problem again reccoured, and I had to re-trace these
work-around steps, and again, was granted the same intern solution.
The other work-around solution appears to be always leaving the MS office
apps running in the background. Apparently, if they are already running, I
can open additional documents.