UPDATE: I'm just playing FFXIV and I got the same DirectX Error (11000002) problem again. Not one, not twice, but three times just now. The only solution that works is switching to DirectX 9c. But the problem is that whenever I'm in a huge group (like hunt groups), it freezes the frame rate and it kicks me out.

I heard about people underclocking but I don't want to screw up my laptop's driver, unless if there's a professional I can talk to.