Unable To Play CODMW2 altriwnet client

HI ,
I am using LAN connection and now when i try to play CODMW2 it is giving error :
System.Net.WebException: The remote server returned an error 404)
Not Found.
at System.Net.WebClietn.DownloadDataInternal(Uri address,
WebRequest& request)
at System.Net.WebClient.DownloadStrings(Uri address)
at System.Net.WebClient.DownloadStrings (String address)
at DBNUpdater.Core.GetData(String fileName)
at DBNUpdater.Core****n(Object state)
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Answer #1
was it working before?
if yes what has changed from then and now.
are you running it as admin?
Answer #2
yes i tryed but it is not working