SQL Server Setup has encountered the following error:
No feature were uninstalled during the setup execution. The requested features may not be installed. Please review the summary.txt logs for further details.
Error code 0x84B30002.
Follow the below steps it may help to uninstall, Before follow this procedure please make sure you have some idea about registry
1. Open Registry Editor
2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\
3. Browse Ids one by one and identify the GUIDs for SQL Server 2008
4. Run the below command for all SQL Server 2008 Guids one by one
msiexec /x “GUID”