If you plan on playing FF14 and money isn't going to be too much of an issue, I highly and vehemently recommend simply getting a beefier system. As for the text disappearing it sounds like GUI glitches that pop up. There is a whole range of GUI related "no display" bugs. Leve widgets don't appear. BR icons don't appear over mobs. Leve Cards pop up blank. Chat log goes completely blank. The newest one on me, started a couple days ago, is all text starts flashing on and off until I enter the main menu.