unable to log in to SQL Server after installing Active directory Domain

   Hi All,

   I had installed SQL server 2008 R2 in windows Server 2008 R2 machine .After that i installed the active directory domain in the same server machine and created a domain .I also added one user to  the domain.After that i am unable to login in the SQL server.I the showing an error on the server name the error codes showing here are errorcode-2,10061,40

 please get me a solution

Thanks to all