You won't be able to run it at max settings because your graphics card is a bit on the low end but you will probably be able to run it with just about every setting on high :D Your Processor, Hard Drive, Operating System and RAM look really good but it's just your graphics card that will keep you from running GTA: IV at max, Honestly I would recommend installing the max ammount of ram that you can, Judging by your specs I'm guessing your motherboard can only take 16 but if I where you I would upgrade that RAM to the limit, It's not expensive and it's really easy to do. I would also really recommend upgrading your graphics card if you really want your game to run at ultra settings. Good luck :)