Demo installation of NAV 2015

Dear all,

I’ve installed Demo of NAV 2015 in Windows 7 64 bit OS. I can connect the Database through RTC client but can’t connect the same through Development Environment.

It gives the following error msg..

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Microsoft Dynamics NAV Development Environment

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The following SQL Server error or errors occurred: 18456,"28000",[Microsoft][SQL Server Native Client 11.0][SQL Server]Login failed for user 'Computer Name\WindowsLogin'.
4060,"42000",[Microsoft][SQL Server Native Client 11.0][SQL Server]Cannot open database "Demo Database NAV (8-0)" requested by the login. The login failed.

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OK

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What is the reason ?