yes exactly.
i already solves this problem.
this is the way i solves it. hope it will be usefull for other beginner like myself.
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verify that the SQL Server service is running. Achieve this by going to Start > Control Panel > Administrative Tools > Services, and checking that the service SQL Server (SQLEXPRESS) is running. If not, start it.
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While you're in the services applet, also make sure that the service SQL Browser is started. If not, start it.
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You need to make sure that SQL Server is allowed to use TCP/IP or named pipes. You can turn these on by opening the SQL Server Configuration Manager
Start > Programs > Microsoft SQL Server 2012 > Configuration Tools, and make sure that TCP/IP and Named Pipes are enabled.
4.otherwise
run Start->Run->Services.msc If so, is it running?
if it not running then
It sounds like you didn't get everything installed. Launch the install file and chose the option "New installation or add features to an existing installation". From there you should be able to make sure the database engine service gets installed.
