Error 28002 : Unknown Error

This was the forth time I was installing TFS 2008 and I got this error for the first time. It has to do with the DNS. TFS is not able to resolve the Domain Name as a result of which it gives TFS3010 (if you see the Event log).
Resolution:
1. Open the web.config from the path below (TFS Root)
%systemdrive%/Program Files\Microsoft Visual Studio 2008 Team Foundation Server/Web Services/Web.config

Add the below key
<add key="<DomainFullyQualifiedPath>" value="dcHostName" />

And hit Retry on the Error message.