It's done

I can't tell why happened but it's done. Now i can view the Local Area connection in Netwotk connections and the connection to internet is fine. But the problem of one way ping is still here.It can't be pinged from other computers.

I logged on through another user account in the computer where i found the local area connection in Network connections. I changed the IP address there which was blank at that time. Then i relogged in from my administrator account which had the fault and typed the 'ipconfig' in the cmd window. And it showed the IP address.

Then i looked for the Local Area Connection icon and i got it in the Network connections. And it is done.