Need help with my computer. GEEK SQUAD GET IN HERE!

[downshift_sideways]

So...I have a PC with Windows Vista Premium Edition.

For some strange reason...whenever I try to go on the internet; it will not allow me. ""Internet Explorer Cannot Display The Webpage".

I see the LAN connection box (bottom right hand corner) if I right click on it, and go to 'Network and Sharing Center'. it shows:

My PC----(alertsign)---Unidentified Network----X----Internet.

^Is highlighter............. ^not highlighter(shadow) .......^Not highlighter(shadow)

(now I used to be able to get a clear signal across from my PC to the internet with no problems....but something messed up)

Now I've tried to troubleshoot it by resetting my LAN, and by Renewing the IP address. Still no luck being able to get a connection.

I have Comcast cable internet. I am connected through a LINKSYS router.
My router is putting out a wireless signal, and I am able to connect to it on my laptop (where I'm typing from).

I've tried to go to RUN..and type in "CMD" The windows command black screen comes up.

I've tried to "ipconfig/release" to release my IP.
and "ipconfig/renew" ...

still no luck...

I've called my internet provider and they say everything on their end is good to go. It's a problem within my pc.

I have taken out my ethernet cable from my PC, and connect it to my laptop...and I get a clear connection
So the problem exists from my computer TO the network.

Can anyone help? or give advice? FREE REP!!