Remove SQL Server Services :
Remove all SQL related services as below
Delete Registry Entries :
1. Backup the registry. ( Run – > Regedit -> File -> Export )
2. Delete the following keys in Registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall —–> delete all the sub-keys referencing SQL Server.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services and delete all the keys referencing SQL Server.
3. Delete all SQL Server folders in Program Files and Program files (X86)
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