ماذا ينقص هذا الكود حتى يشتغل على الويندوز7

كود :
function GetIdeSerialNumber():string;
const IDENTIFY_BUFFER_SIZE = 512;
type
  TIDERegs = packed record
    bFeaturesReg     : BYTE; // Used for specifying SMART "commands".
    bSectorCountReg  : BYTE; // IDE sector count register
    bSectorNumberReg : BYTE; // IDE sector number register
    bCylLowReg       : BYTE; // IDE low order cylinder value
    bCylHighReg      : BYTE; // IDE high order cylinder value
    bDriveHeadReg    : BYTE; // IDE drive/head register
    bCommandReg      : BYTE; // Actual IDE command.
    bReserved        : BYTE; // reserved for future use.  Must be zero.
  end;
  TSendCmdInParams = packed record
    cBufferSize  : DWORD;
    irDriveRegs  : TIDERegs;
    bDriveNumber : BYTE;
    bReserved    : Array[0..2] of Byte;
    dwReserved   : Array[0..3] of DWORD;
    bBuffer      : Array[0..0] of Byte;  // Input buffer.
  end;
  TIdSector = packed record
    wGenConfig                 : Word;
    wNumCyls                   : Word;
    wReserved                  : Word;
    wNumHeads                  : Word;
    wBytesPerTrack             : Word;
    wBytesPerSector            : Word;
    wSectorsPerTrack           : Word;
    wVendorUnique              : Array[0..2] of Word;
    sSerialNumber              : Array[0..19] of CHAR;
    wBufferType                : Word;
    wBufferSize                : Word;
    wECCSize                   : Word;
    sFirmwareRev               : Array[0..7] of Char;
    sModelNumber               : Array[0..39] of Char;
    wMoreVendorUnique          : Word;
    wDoubleWordIO              : Word;
    wCapabilities              : Word;
    wReserved1                 : Word;
    wPIOTiming                 : Word;
    wDMATiming                 : Word;
    wBS                        : Word;
    wNumCurrentCyls            : Word;
    wNumCurrentHeads           : Word;
    wNumCurrentSectorsPerTrack : Word;
    ulCurrentSectorCapacity    : DWORD;
    wMultSectorStuff           : Word;
    ulTotalAddressableSectors  : DWORD;
    wSingleWordDMA             : Word;
    wMultiWordDMA              : Word;
    bReserved                  : Array[0..127] of BYTE;
  end;
  PIdSector = ^TIdSector;
  TDriverStatus = packed record
    bDriverError : Byte;
    bIDEStatus   : Byte;
    bReserved    : Array[0..1] of Byte;
    dwReserved   : Array[0..1] of DWORD;
  end;
  TSendCmdOutParams = packed record
    cBufferSize  : DWORD;
    DriverStatus : TDriverStatus;
    bBuffer      : Array[0..0] of BYTE;
  end;
  var
    hDevice : THandle;
    cbBytesReturned : DWORD;
//    ptr : PChar;
    SCIP : TSendCmdInParams;
    aIdOutCmd : Array [0..(SizeOf(TSendCmdOutParams)+IDENTIFY_BUFFER_SIZE-1)-1] of Byte;
    IdOutCmd  : TSendCmdOutParams absolute aIdOutCmd;

procedure ChangeByteOrder(var Data; Size : Integer );
var
  ptr : PChar;
  i : Integer;
  c : Char;
begin
    ptr := @Data;
    for i := 0 to (Size shr 1)-1 do
    begin
      c := ptr^;
      ptr^ := (ptr+1)^;
      (ptr+1)^ := c;
      Inc(ptr,2);
    end;
  end;
begin
  Result := ''; // return empty string on error
  if SysUtils.Win32Platform=VER_PLATFORM_WIN32_NT then // Windows NT, Windows 2000

begin
//íãßä ÊÛíÑ PhysicalDrive0 Çáì PhysicalDrive1 Çæ PhysicalDrive2
   hDevice := CreateFile( '\\.\PhysicalDrive0', GENERIC_READ or GENERIC_WRITE,
  FILE_SHARE_READ or FILE_SHARE_WRITE, nil, OPEN_EXISTING, 0, 0 );
  end
  else // Version Windows 95 OSR2, Windows 98
  hDevice := CreateFile( '\\.\SMARTVSD', 0, 0, nil, CREATE_NEW, 0, 0 );
  if hDevice=INVALID_HANDLE_VALUE then Exit;
  try
    FillChar(SCIP,SizeOf(TSendCmdInParams)-1,#0);
    FillChar(aIdOutCmd,SizeOf(aIdOutCmd),#0);
    cbBytesReturned := 0;
    with SCIP do
    begin
    cBufferSize  := IDENTIFY_BUFFER_SIZE;
    bDriveNumber := 0;
   with irDriveRegs do
   begin
     bSectorCountReg  := 1;
     bSectorNumberReg := 1;
     bDriveHeadReg    := $A0;
     bCommandReg      := $EC;
    end;
    end;
    if not DeviceIoControl( hDevice, $0007c088, @SCIP, SizeOf(TSendCmdInParams)-1,
      @aIdOutCmd, SizeOf(aIdOutCmd), cbBytesReturned, nil ) then Exit;
  finally
    CloseHandle(hDevice);
  end;
  with PIdSector(@IdOutCmd.bBuffer)^ do
  begin
    ChangeByteOrder( sSerialNumber, SizeOf(sSerialNumber) );
    (PChar(@sSerialNumber)+SizeOf(sSerialNumber))^ := #0;
    Result := PChar(@sSerialNumber);
  end;
end;
function get_password(a: string): string;
var
  b: string;
  c: char;
  i,n: integer;
begin
  b:='';
  for i := 1 to length(a) do
  begin
    c:= a[i];
    n:= ord(c);
    n:=n+(2*i);
    b:=b+chr(n);
  end;
  Result:=b;
end;