It could be that all that memory is shared. My 9800GT 512 mb shows up as 2303 mb in the gpu proprieties even tho its physical memory is just 512 mb. Shared memory is slow and results in low performance.
You need to be a bit more specific than that lol. I was referring to the actual full name of it.
I think you can get it from the official site, assuming you got the game through legal manners. If it's not there then remember google is always your friend when it comes to this.
Then I can't help you much here I think. Haven't even heard of Intel graphic cards, I think they might be some low budget integrated video cards or something. Not even google gives me much info about that card ^^
Try to update GTA 4 and see how that goes. If it still shows 128 mb then that is your real memory. I would be surprised if it was as much as you said it was, considering that only the high end of the Nvidia/ATI video cards reach that physical memory.