- Stop all SQL Server Services
- Remove all SQL Server Services
- Control Panel – Add/Remove Programs – Select and Remove all Microsoft SQL Server programs
- Open regedit and remove all SQL Server folders in this registry key:
HKEY_LOCAL_MACHINE/ SOFTWARE/MICROSOFT
- Remove SQL Server folders from Program Files directory
- Reboot
To remove all SQL server Service you can try this command:
start -> run -> cmd : sc delete [service name]