Can’t connect to SQL Server 2008R2 on Windows Server 2008R2

installationsql-server-2008sql-server-2008-r2windows-server-2008windows-server-2008-r2

I reinstall a server Windows Server 2008 R2, I installed SQL Server 2008 R2 no problem during installation. When I try to connect with "Microsoft SQL Management Studio" via sa account or Windows Administration account, I have this error (picture1), the second picture (picture2) show the services staarted.

I read some posts about this but no success 🙁

Picture1:
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Picture2:
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Best Answer

Isn't that the default instance, for which you DO NOT GIVE A NAME IN THE CONNECTION STRING?