Throw your computer out the window....no....wait...don't do that....maybe a hammer.... >.>

I think just looking at the client troubles the client. Can always hope for a new windows update to replace the old one perhaps (they should be due for December updates soon I believe). but those Direct X errors just have zero information to them... The fact its only affecting your FFXIV game makes you think its just a SE problem, but at the same time, Windows has broken Direct X in the past too... so... maybe that hammer is looking like an option... :/