with my experience with many failed installation registry keys are left in corrupted state and only solution would be to remove them.But you need expert to fiddle with registry
First, download the SQL Server express edition from this location. Additionally, I will also explain how we can use the SQL Server installation configuration file to perform an unattended (silent) installation.
#What files can be deleted with sql 2012 express install#
Open a case with Microsoft and allow them to have a look at your system. In this article, I am going to explain how we can install SQL Server 2012 express edition using the SQL Server installation center. If you dont find this useful or have confusion dont proceed. Rename all the SQL Server folders in the computer. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services and delete all the keys referencing SQL Server. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall and delete all the sub-keys referencing SQL Server. ◦-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer ◦-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server Please read in details the MS link before proceeding. Uninstall the existing SQL Server and all the components from the add remove program. Note: Removing necessary registry entries might cause inconsistency so backup registry before doing changes. If still you face problem you might as well try below suggesstion which involves removing registry entries. Its is for 2008 r2 but would be applicable to 2012 as well. If you have multiple instances below suggesstion would not work so dont use it.įirst please refer to below Microsoft support link for what actions to follow before removing SQL Server instance. Follow below method, this method was given by Microsoft forum team and is recommended way to remove have helped me and forum users many time. This can be fixed by deleting few registry keys related to SQL server. My guess is since you have remamants of failed installation still present in your system that is why you cannot install the new instance.
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