Error message: Ethernet doesn't have a valid ip configuration and unable to connect to Internet after installing Windows 8.

Respected Manorajan,

Me too had d same problem but i solved it later on myself.

Here's it how to :-

1- Make sure u have intel network driver installed i ur windows it pc. Download it ( on any other pc and transfer and install it into this one) and install it in ur respective windows 8 pc. Here's the link to download it :- http://drivers.softpedia.com/get/NETWORK-CARD/INTEL/Intel-Network-Adapter-Driver-172-for-Windows-8.shtml

Den download realtek lan driver from here install it http://drivers.softpedia.com/get/NETWORK-CARD/REALTEK/Intel-Realtek-LAN-Driver-80030730-for-Windows-8.shtml..if in installing theres any error ignore it..dont panic and reinstall..as it will already be installed

2-unplug your LAN cable and wireless connection 

3-Go to network and sharing center den on d left side click on change adapter settings left clik on intel network adapter

4-Go to  "Ethernet Adapter local area connection" properties and deselect '' Internet Protocol Version 6 (TCP/IPv6)''

5- select **"**Internet Protocol Version 4 (TCP/IPv4)"

And press Properties button

6- select "Use the following IP address:" option and set this ips

IP= ''ur ip address''

subnet mask=255.255.255.0

default gateway = your router ip  (you can recheck all dis from any other pc having a successful conection wid dis same one by checking the properties of d connection or from any smart phone like any iphone or android mobile if it is used as a wifi too by seeing staus/properties of ur respective wifi name  )

7- from second section select "Use the following DNS server addresses:"

set**"PreferAlternate DNS server:"** your router ip which u entered in ''default gateway'' above. press ok and try to connect through lan then wireless