Manually remove sql server 2008 r2

Details: Remove SQL Server Manually Incomplete Install or incomplete uninstall of SQL Server Manually Uninstall SQL Server 2000/2005 Instances which are not completely un - installed or rolled back while Chose SQL Server 2008 R2 then Right-click Uninstall /Change. Click OK to proceed. Removed directories related to SQL Server from Program Files (including x86), Removed all references to those directories from the registry. This must be done manually: in some situations, it seems better to remove the whole parent key; in others, only the value must be removed; finally I do this steps in my SQL Server 2012 and you can make this steps in Any version like 2005 - 2008 - 2008 R2 Also To remove or Add or repaire SQL Server : 1- Go to Programe and Feature. 2- Select your SQL Server name. 3- Write click on the name and select Uninstall. 4- If you want to add New