MS SQL 2008 Server cannot logon on local Mgmt-Studio with Windows Authentication

i have installed a windows 2008 r2 server with sql 2008 on it...
the security settigns are: mixed mode (windows authentication + sql server authentication)
on a remote server/client i can start management studio and can logon with windows authentication. (eg. domain admin user)

with the same domain admin user logged on on the SQL server itself, i cannot connect with the sql management studio (windows authentication) ??
if i change to SQL user authentication and enter the SA user everything works fine...

so why cannot i connect with mgmt-studio on the SQL server itself with a windows user?

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
and the error message is?
Right click on Microsoft SQL Server Management Studio and runas administrator

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Alpesh PatelSolution Architect at TCS (SAFe®Agilist, TOGAF® Foundation, PSM I®, MCP, MCSD)Commented:
need user is created on system.
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Microsoft SQL Server 2008

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