Missing folder in registry


while installing sql server express 2012 got error "wait on database engine recovery handle failed. check sql server error log potential causes." saw people problem changed service nt authority\system , error warning no longer came up. want change login mode mixed , must done in registry folder mssql. <instance name> not exist. how can problem fixed? how can install sql server express 2012 no errors?

hi s. jones25,

firstly, please uninstall previous failed installation fragments of sql server following instructions in article. if not able uninstall sql server completely, please perform steps below uninstall sql server, below steps (about removing reg keys) work correctly sql server having 1 instance.

    1. uninstall existing sql server  and components add remove program.

    2. backup registry  .

    3. delete following keys using regedit:

               --hkey_local_machine\software\microsoft\microsoft sql server

               --hkey_local_machine\software\microsoft\mssqlserver

    4. go hkey_local_machine\software\microsoft\windows\currentversion\uninstall , delete sub-keys referencing sql server.

    5. go hkey_local_machine\system\currentcontrolset\services , delete keys referencing sql server.

    6. rename sql server folders in computer.

    7. reboot machine.

secondly, start fresh installation, make sure right click on setup file , select run administrator launch setup. when reach page please select startup account database engine services nt authority\system. after installation completes please change service account nt authority\system low privileged account.

however, if still same error message after following above method, please post detailed error message sql server error log. sql server error log can found in %program files%\microsoft sql server\mssql11.mssqlserver\mssql\log\ errorlog. if encounter same issue in  similar blog, please follow steps in resolve issue.

thanks,
lydia zhang

lydia zhang
technet community support




SQL Server  >  SQL Server Setup & Upgrade



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