Sorry for the double post but on a whim I opened the NVidia control panel and noticed that you can set application specific settings for Metro/Modern UI apps in the Manage 3D Settings pane. You could theoretically set FXAA to off for each app with this issue and it would provide a workaround...
You don't need to reinstall the drivers to fix this.
Just open the NVidia control panel and click the "Restore" option in "Manage 3D Settings".
I can't guarantee it works for all NVidia cards, but it works on my 9600M GS and someone else's card (I found the trick on another site but I can't...