Yip, that should do it! wonder how that happened....
Might have done it for the rest of your office apps too; if you open 'my computer' or 'windows explorer' and select 'tools' -> 'folder options' & then click on 'file types' (give your computer a minute or two here, this always takes ages) it'll show all the file types it knows about and what program it will use to open them with (you can also then check that .doc is still associated with word or if it still thinks that windows media can do it!).
That's Windows XP anyway, I've avoided anything later than that so far.