Tutorial on

but most of all happens for automatic Wifi/LAN configuration by MODEM / Router .

But to day i will introduce to make it default again ..

I have Give here some of screenshots here ..

I hope u will see it and learn how to troubleshoot this problem .. 

Step 1

open network and sharing center
then change adepter setting

 Step 2
Double click on Wireless Network Connection

STEP 3
Then Properties

 Step 4

Select IPV4

Step 5

Step 6