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Use CreateToolHelp32SnapShot function with TH32CS_SNAPPROCESS parameter for getting snapshot of Win32 processes. And use Process32First and Process32Next for getting information about these processes. Don't forget to add TLHelp32 to the uses chapter.

uses TLHelp32;
...
procedure TForm1.Button1Click(Sender: TObject);
var
  MyHandle: THandle;
  Struct: TProcessEntry32;
begin
  MyHandle:=CreateToolHelp32SnapShot(TH32CS_SNAPPROCESS, 0);
  Struct.dwSize:=Sizeof(TProcessEntry32);
  if Process32First(MyHandle, Struct) then
    Memo1.Lines.Add(Struct.szExeFile);
  while Process32Next(MyHandle, Struct) do
    Memo1.Lines.Add(Struct.szExeFile);
end;