Is my mac killing my internet?

I'm not sure if this is the right place for this at all, but let's hope it is.
I'm also not sure which "type" of airport I have (express, etc), all I know is that every time I connect to a 2WIRE### connection, the internet instantly dies.
We have this type of internet at home (I'm not too savvy with this stuff, so I'm doing my best, trying to explain it), and it goes out a LOT. Every few minutes, it dies for a while, and comes back, and repeats, and yeah it's pretty frustrating.
So anyways, I went to my friends house, and he has the same type of router (2WIRE###), and I tried to connect to it. The moment I got on, the internet stopped working (for all computers in the house), and it was the first time it had happened to him. And of course, once I disconnected, their internet was fine.
What's going on, and how can I fix it? Thanks!

In your MacBook's Apple menu > System Preferences > Internet > show Airport, under the TCP/IP tab, what settings do you see?

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HungryWriter wrote:
I would be working fine on my MacBook, but once my wife tries to get online with the iMac, it kicks us both off! If she's online on the iMac and I try to get online on the MacBook it kicks us off!
Welcome to Apple's discussion groups.
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Hello AyaTheBookWorm,
Thanks for using Apple Support Communities.
I can definitely understand how this is frustrating, I would feel the same way. To troubleshoot this issue please see the steps below, as well as checking out the Wireless Diagnostics.
Symptom: The network connection drops unexpectedly
Your Mac may not not stay connected to your Wi-Fi network reliably.
Your Mac may stop accessing the Internet during use.
Solution
Use these steps if your computer disconnects from its Wi-Fi network unexpectedly.
Check your range to the Wi-Fi router and reduce the effect of interference.
If your computer is too far from your Wi-Fi router or your environment has too much Wi-Fi interference, then your computer may not detect the Wi-Fi network properly. The easiest way to check for range limits with your Wi-Fi network is to move your computer or your Wi-Fi router closer together and make sure that there are no obstructions (such as walls, cabinets, and so forth) between the router and your computer.
See Potential sources of wireless interference for more information about interference and solutions.
Try connecting to a different Wi-Fi network. If your computer works fine when connected to a different Wi-Fi network, then the issue may be related to your network router or ISP. In that case, contact the manufacturer of your router or your ISP.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
About Wireless Diagnostics
http://support.apple.com/kb/HT5606
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Is my mac killing my internet?

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