You should run the repair from the original installation media, using the following command line:
setup.exe/action=repair/indicateprogress=true
Repair the common shared components and features first, and then Repeat the command to repair the instances installed. During The repair process, the Setup dialog box disappears. As long as the progress window does not show a error, the repair process is proceeding as expected.
note the following error messages can be found as text Messages in the event log or in the Setup logs that is located in one of the following folders, and they indicate that yo U should repair your affected instance being proceeding further:
- For SQL Server, and for SQL Server R2: C:\Program Files\Microsoft SQL Server\100\setup Bootstrap
- For SQL Server: C:\Program Files\Microsoft SQL Server\110\setup Bootstrap
https://support.microsoft.com/en-us/kb/969052
[SQL] SQL Repair Command
