The integrated GPU on your motherboard is woefully underpowered when it comes to FF XIV (so far below minimum requirements that it is not even funny), which you already found out, there is nothing you can do to make the game run well on that.
Depending on you expectations on how well and the detail you want to run the game it, you might be looking at a new PC all together, as it sounds like your HDD is slow, and you probably do not have a PSU capable of running a decent video card.