I think the default language is as speified in the document template (probably Normal.dot). That file can get corrupted or infected by a macro virus.
I would search for all copies of Normal.dot and rename as Normal.old (while Word is not open).
When you open Word it will recreate Normal.dot. You could then make Normal.dot read only which should lock everything down. If you want customisations eg of styles do that in another template - at least until it is clear whether the problem is resolved.
You should also be able to go into add/remove programs. Customize the Office install and remove the french lang. selection. I had the smae problem with spellcheck checking in french.
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