Network Not Connected to the Internet When It Is

[wrigh472]

I have recently returned home from college, where I had my Gateway desktop hooked up to the internet via ethernet. Now that I am home, and on the opposite side of the house from the router, I need to use my parents' wireless network. I have not had issues in the past with my old computer - this computer is new, just bought this past September.

The Network:

• Brand New Macbook Pro - Hub, connected to modem directly (DSL)
• Wireless Router - SMC G network
• Old Mac G4 in my Brother's room - Airport Card
• Old Mac Cube in Family room - AirPort Card
• Gateway Desktop FX4710 - Bought an Encore 802.11n Wireless PCI Adapter from NewEgg.com (it had great ratings and was noted for its distance - it has three large antennas on the back)

So, here is my issue. When I turn on my computer and connect to my Home Network, it reads everything perfectly and I have access to the Internet for about half a minute. After that, it pretty much kicks me off giving the error page that reads:

ADDRESS NOT FOUND

Firefox can't find the server at...

Of course it does not just do this with Firefox, other browsers give much the same error. So when that happens and I open Vista's lovably complicated networking interface I see my computer on the left, connected to the router in the middle (WRIGHT WIRELESS). This connecting is green and looks perfect. Then, this is the weird part: it says the Router is not connected to the internet, which is then on the far right of this little diagram.

I just don't get it. The other computers in my house connect fine, and I never had any issues connecting with my old Dell Laptop. It even shows, when you hover over the 'Wireless' icon on the task bar, that I am connected, and that the signal is 'Strong.'

I do not know what I am doing wrong, if anything, and I am very open to any suggestions. I am worried that it may be a card issue (yes I know it is an N Network card, but it should work fine with my G) or a Mac -PC compatibility issue. Both of them would be a pain to try and overcome.

Thanks in advance for any held you all can give me :D