modem driver not working for 64 bit  

so you mean if mine isn't wireless right? I'm planning to get a new router too in a few days for different reasons, and probably also a wireless card

Get a router with a built in modem and support for Gigabit Ethernet, are you putting in a pci wireless card? If so, look for wireless N support.

cool ok, would I still need a usb cable for the second ip then? or would i be able to do it wirelessly

Your wireless router should manage all the settings, along with 7. What do you mean about a second IP?

Will you be going for an internal wireless n card or an external one?

internal one. Its in my op, right now I need to also use an USB cable to connect from my modem to my computer to have access to an second ip. Its for playing games like startcraft online on the same network with my brother

Ahhh, choose a wireless modem with support for gigabit networking, then use ethernet for LAN gaming. 7 will do it. You should also be able to have wireless and ethernet at the same time. Choose a wireless n card for pci-Express x1 if you can. What motherboard slots do you have free? You also need to make sure nothing is blocking something else.

I dont mean LAN gaming. I want to play online as in battle.net. the thing is right now that when I host a game and my bro joins and other people joins, the game gets extremely laggy

Edit: my motherboard I'm pretty sure has the slot open, the graphic hard is a bit huge though

Lagginess depends on your ISP and ping times. What GPU?

I have high speed internet with shaw, running a Core i5 with a Radoen 5850. But its not about the my specs. The problem is that the game cannot handle two people connecting to it on the same ip. So we need an second ip and shaw gives us the option to do that by connecting a usb cable from my modem to my computer. But the thing is that the driver for that usb connection is too old for a 64 bit OS and there are no updates for it

Try the wireless router with modem.