PCI Router

Hi Tech guru’s. I’m an avid gamer and I regularly play the lads on pc games. I host as I have the most powerfull rig. The problem is that they keep getting network interupted messages. We have narrowed it down after finger pointing and accusations of cheating to my network card. I have an updated Netgear 311v3 installed and it just cant take 3-4 laptops connecting to it. Can you reccomend an internal router type card that will be able to handle multiple computers? I only want to go for the external router option if there is absolutly no other way of having an internal card.