Okay let's stop for a moment. 1st, a game (software) can't make your internet 'cut out' what you can do is run too much data that you overload your wireless router your connecting to. That said, it is a networking issue, not a game issue.
First what games are we talking about, because your hardware is way too low to be trying to play BF4, AC3, etc. much less a multiplayer game.
Second, your trying to connect wirelessly to what make / model router?
Third since you want to game over the router, how many other communicating devices are on this network (phones, computers, tablets, etc.)
Fourth do you have access to the Admin page in the router (i.e. it wasn't provided by the ISP)?
Fifth set all connecting devices to use QoS (Qualit of Service) in their Network Properties, then setup the QoS table in your Router.
Sixth, download and install http://www.xirrus.com/Products/Network-Management-and-Software/Network-Management/Wi-Fi-Inspector, use it to see how many wireless places are nearby and what channels they use. Make sure your router name isn't duplicated (you see four listed 'CableTV Wireless" listed) and you aren't on a channel used by any neighbor devices (you see three wireless on Channel 7, so you change to channel 9 for example).