For better troubleshooting, you need provide more detailed information about this error.
What is more, i put uninstall SQL Server steps here for your reference.
- Remove all SQL Server components from 'Programs and Features'
- Backup the registry
- Delete the following keys in regedit:
--HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server
- Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall and delete all the sub-keys referencing SQL Server
- Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services and delete all the keys referencing SQL Server
- Reboot the machine
In addition, please use an administrator account to reinstall SQL Server on your computer(Right click->run as administrator).
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