Wire connected but no internet?

[Sahil]

I clean installed win7 on my old computer.
I could not get an internet connection as there were no drivers but somehow it installed the drivers itself. I connected my ethernet wire into my desktop and the light on my router and the back of my pc became on. But there was no internet connection. Lan was disconnected in the bottom right corner. The wire is ok as i connected it to my laptop and it worked. I did the ipconfig thing and it showed:
Media state ........... : Media disconnected
Connection specific dns suffix.:
I tried to ping google but it showed:
ping request could not find host google.com Please check name.....
i even turned off firewall. But still no internet. Pls help me
their is a red cross below Local area connection but wire is connected