This Vista Update, delivered 9/4/07 at about 3am (for one machine, anyways) has some serious issues, so beware.
Now, when I load Word 2007, if I immediately quit Word, it crashes. And if I attempt to load a document by dbl clicking on it, Word fails to load the document completely, just opens an empty window. Even odder though, is that I have a different machine that I pulled the update earlier for (it's set to manual update) and it's fine.
The only difference between the two that I can see, is that on the failed machine, Word was OPEN at the time of the upgrade.
Even worse, UNDOING the Patch caused the machine to fail to boot. It would start to boot up, then just shut down.
I had to use the "Boot to last known valid configuration" option, then use the System Restore Point function to rewind back to before the 3am patch.
Once I'd done that, everything ran fine again.
Ah the joys of automated updates.