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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
uses registry;

procedure TForm1.Button1Click(Sender: TObject);
var
  Reg: TRegistry;
  Val:TStringList;
  I:Integer;
begin
  Reg:=TRegistry.Create;
  try
    Val:=TStringList.Create;
    try
      Reg.RootKey:=HKEY_LOCAL_MACHINE; // Section to look for within the registry
      if not Reg.OpenKey(Edit1.Text,False) then
        ShowMessage('Error opening key')
      else
      begin
        Reg.GetValueNames(Val);

        for I:=0 to Val.Count-1 do
        begin
          ShowMessage(Edit1.Text + Chr(13) +
                      'has an Entry Called '+Val.Strings[I]+Chr(13)+
                      'With a Value of '+Reg.ReadString(Val.Strings[I]));
        end;
        if MessageDlg('Ok to delete the key and lose all these values?'
                     ,Mtinformation,[mbYes,mbNo],0)=mryes then
           Reg.DeleteKey(Edit1.Text);

      end;
    finally
      Val.Free;
    end;
  finally
    Reg.Free;
  end;
end;
end.                    

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Reg.CloseKey;

if MessageDlg('Ok to delete the key and lose all these values?'
  ,Mtinformation,[mbYes,mbNo],0)=mryes then
  Reg.DeleteKey(Edit1.Text);                    

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'Ok to delete the key and lose all these values?'                    

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Reg.DeleteValue