+1 to nosupport4u. From what I remember, version/patch 1.4 is one of the better ones out there. Do keep in mind though that GTA IV wasn't really ported optimally, so it doesn't run that well even on high end setups. It's also very CPU and RAM hungry (in my case when I disabled my i7's OC and hyperthreading I lost around 30-40% of the FPS). So yeah, your processor and RAM might actually be the problem if updating doesn't cut it for you.