Hi
Did you get a driver disk with your computer?
If you did look on there, since you don't have an internet connection Windows can't look for them during installation.
If you don't have a disk try and figure out what device drivers you need and download them on another computer.
You can also try removing your Ethernet Controller in Device Manager and rebooting.
Let Windows go through the whole install process for the controller again and maybe it will find them.
If you wan't to install Windows 8 on a partition start the install by booting from the DVD and select Custom.
It will then ask you where you want to install it, I don't think it gives you that option if you install from inside Windows 7.
I haven't been able to get it to install on my computer so far, it gets to a certain spot and then the desktop disappears to black and that's it.
I don't think it's loading my video drivers, I'll work on that tomorrow.
Good luck.
Mike