If your CPU is a single or dual core, then you definitely will NOT be able to play it.
Not sure what your video card is. Is it an ATI 5xxx series? Those, along with the newest nVidia cards, are the only cards that can do DX11. As it is, GTA IV doesn't use DX11 anyways, so the DX version doesn't matter.
As the previous poster stated, you really need to be more detailed in your system specs because what you have is so generic, it means nothing to us and we can only guess.
But, based on what you've listed, your machine is not even remotely capable of running GTA IV.