Delete complete Software Manually

Many times it happens that when we try to uninstall a program or software from add and remove programs of control panel, it don't delete or sometimes after deletion also some files of deleted software do not delete from your computer and eat space of memory. So here a way for completely remove softwares by manual method.
For e.g. if i want to remove Microsoft media player then here is the process:-
1. Choose Start > Run and type "regedit" and click on OK
2. Before deletion Make a backup copy of the Registry by choosing Registry > Export Registry File, choosing a location and name for the backup file in the Export Registry File dialog box, then clicking Save.
3. Open the Hkey_Local_Machine \Software\Microsoft; select the media player, then press the Delete key.
4. Exit from the Registry Editor.