Sounds like a PC specifications problem to me, then. Your laptop doesn't even meet minimum specs, so it will be hard to get the full FFXIV experience. You basically have two options.

1. You can lower all of your FFXIV graphic settings, turn off background programs, adjust your computer for best performance, etc. Hopefully the game will be playable that way.

2. Buy a new laptop or Desktop that has a decent graphics card.

:Edit: Oh, and one other option..

3. Wait for the PS3 release.