Can I run GTA IV on Intel dual core 2.6ghz, 2gb RAM and Asus NVIDIA GeForce 610 GT 2gb graphics card.
Nope. The cpu might be ok for lower settings but that gpu will not run it. I think the requirements say a quad core is needed, but thats usually bs, but that card is not going to be up for the job.
I personally have tried a GT 610 for giggles on my brother's computer before we upgraded it and no, it will not work. It runs okay-ish on a GTX650, but still not very good.