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var
  Form1: TForm1;
  i:integer;
  reg:tregistry;
  list:tstringlist;
implementation

{$R *.dfm}

procedure GetAllKeys(root:HKEY;Key:string;node:TTreenode);

begin
   reg:=Tregistry.Create();
   reg.RootKey:=root;
   reg.OpenKey(Key,false);
   if reg.HasSubKeys then begin

   list:=TStringlist.Create;
   reg.GetKeyNames(list);
   For i := 0 to list.Count-1 do begin
      if list[i]<>'' then begin
       GetAllKeys(root, Key+'\'+list[i],Form1.TreeView1.Items.AddChild(node,list[i]));
      end;
   end;

   end;
   reg.free;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
Treeview1.Items.BeginUpdate;
GetAllKeys(HKEY_LOCAL_MACHINE,'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall',Treeview1.Items.Add(nil,'HKEY_LOCAL_MACHINE'));
Treeview1.Items.EndUpdate;
end;