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Kode 

#define WINVER  0x0500
#define _WIN32_IE 0x0500
#define _WIN32_WINNT 0x0500
#include <windows.h>
#include <string.h>
#include <stdlib.h>
//---
#define WINDOW_WIDTH  150
#define WINDOW_HEIGHT 100
//---
#define TRAY_MESSAGE (WM_APP + 123)
#define IDC_BUTTON1 1001
#define IDC_STATIC  1002
#define IDC_BUTTON2 1003
#define IDM_TIMER   1004
//---
#define IDC_STATIC_1 1200
#define IDC_STATIC_2 1201
#define IDC_TIMER_1  1202

HHOOK KeyboardHook;

HINSTANCE InstanceHandle;
int Trans;
HBRUSH TextBrush;
POINT MyPos;
void Minimize(HWND hwndDlg);
void UnMinimize(HWND hwndDlg);
void SetBaloonTip(HWND hwndDlg);
HICON HIcon;

LRESULT LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
   if(nCode == HC_ACTION)
   {
      KBDLLHOOKSTRUCT *HookStruct = (KBDLLHOOKSTRUCT *)lParam;
      if(HookStruct->vkCode == VK_LWIN || HookStruct->vkCode == VK_RWIN)
      {
         return TRUE;
      }
   }

   return CallNextHookEx(KeyboardHook, nCode, wParam, lParam);
}

LRESULT CALLBACK DialogProc(HWND hwndDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
   switch(msg)
   {
   case WM_CREATE:
   {
      CreateWindow("BUTTON",
                   "Activate!",
                   WS_CHILD | WS_VISIBLE,
                   5, 22, 160, 34,
                   hwndDlg,
                   (HMENU)(IDC_BUTTON1),
                   InstanceHandle,
                   0);
       CreateWindow("STATIC",
                   "Version 1.0",
                   WS_CHILD | WS_VISIBLE,
                   45, 5, 75, 16,
                   hwndDlg,
                   (HMENU)(IDC_STATIC),
                   InstanceHandle,
                   0);
       CreateWindow("BUTTON",
                   "Close",
                   WS_CHILD | WS_VISIBLE,
                   87, 58, 78, 16,
                   hwndDlg,
                   (HMENU)(IDC_BUTTON2),
                   InstanceHandle,
                   0);  
      CreateWindow("STATIC",
                   "Some multi line\\r\\nText",
                   WS_CHILD | WS_VISIBLE | SS_CENTER,
                   5, 5, WINDOW_WIDTH - 10, 45,
                   hwndDlg,
                   (HMENU)(IDC_STATIC_1),
                   InstanceHandle,
                   0);
      CreateWindow("STATIC",
                   "Text in red",
                   WS_CHILD | WS_VISIBLE | SS_CENTER,
                   5, 50, WINDOW_WIDTH - 10, 45,
                   hwndDlg,
                   (HMENU)(IDC_STATIC_2),
                   InstanceHandle,
                   0);

      SetWindowPos(hwndDlg, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_ASYNCWINDOWPOS);
      LONG OldState;
      LONG NewState;
      OldState = GetWindowLong(hwndDlg, GWL_STYLE);
      NewState = OldState & ~WS_CAPTION;
      SetWindowLong(hwndDlg, GWL_STYLE,  NewState);
      OldState = GetWindowLong(hwndDlg, GWL_EXSTYLE);
      NewState = OldState | WS_EX_LAYERED | WS_EX_TRANSPARENT | WS_EX_TOOLWINDOW;
      SetWindowLong(hwndDlg, GWL_EXSTYLE, NewState);
      SetLayeredWindowAttributes(hwndDlg, 0, 0, LWA_ALPHA);
      SetTimer(hwndDlg, IDC_TIMER_1, 100, 0);
      TextBrush = CreateSolidBrush(RGB(255, 255, 255));
      break;
   }
   case TRAY_MESSAGE:
      if(lParam == WM_LBUTTONDOWN)
      {
         UnMinimize(hwndDlg);
      }
      break;
   case WM_CTLCOLORSTATIC:
   {
      HDC dc = (HDC )wParam;
      SetBkMode(dc, TRANSPARENT);
      int Id = GetDlgCtrlID((HWND )lParam);
      if(Id == IDC_STATIC_1)
         SetTextColor(dc, RGB(0, 0, 0));
      else
         SetTextColor(dc, RGB(255, 0, 0));
      return (LRESULT )TextBrush;
   }
   case WM_TIMER:
   {
      Trans += 4;
      if(Trans >= 0x200)
         PostQuitMessage(0);
      else if(Trans < 0x100)
         SetLayeredWindowAttributes(hwndDlg, 0, Trans, LWA_ALPHA);
      else
         SetLayeredWindowAttributes(hwndDlg, 0, 255 - (Trans - 0x100), LWA_ALPHA);
      break;
      case WM_COMMAND:
      if(HIWORD(wParam) == BN_CLICKED &&
         LOWORD(wParam) == IDC_BUTTON1)
      {
         Minimize(hwndDlg);
      }
      break;
   }
   }
   return DefWindowProc(hwndDlg, msg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, INT)
{
   InstanceHandle = hInstance;
   HBRUSH BackBrush = CreateSolidBrush(RGB(0xA0, 0xA0, 0xFF));
   WNDCLASS wc;
   HIcon = LoadIcon(0, IDI_WINLOGO);
   HIcon = (HICON )LoadImage(0, "KeyIcon.ico", IMAGE_ICON, 0, 0, LR_DEFAULTSIZE | LR_LOADFROMFILE);
   memset(&wc, 0, sizeof(WNDCLASS));
   wc.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
   wc.lpfnWndProc = DialogProc;
   wc.hInstance = InstanceHandle;
   wc.hbrBackground = BackBrush;
   wc.hbrBackground = (HBRUSH )(COLOR_BTNFACE + 1);
   wc.lpszClassName = "WhateverClass";
   wc.hCursor = LoadCursor(NULL, IDC_ARROW);
   if(!RegisterClass(&wc))
      return FALSE;
   int Width = GetSystemMetrics(SM_CXFULLSCREEN);
   int Height = GetSystemMetrics(SM_CYFULLSCREEN);

      HWND WindowHandle = CreateWindow("WhateverClass",
                                    "Windows KeyKiller", // Caption text
                                    WS_VISIBLE | WS_CLIPSIBLINGS |
                                    WS_CLIPCHILDREN | WS_CAPTION |
                                    WS_BORDER | WS_SYSMENU,
                                    450, 300, 175, 124,  // Position
                                    0,
                                    0,
                                    InstanceHandle,
                                    0);
   MSG Msg;
   while(GetMessage(&Msg, WindowHandle, 0, 0xFFFF) > 0)
   {
      TranslateMessage(&Msg);
      DispatchMessage(&Msg);
   }
   return 0;
}
void InstallHook(void)
{
   if(KeyboardHook)
      return;

   KeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC  )LowLevelKeyboardProc, GetModuleHandle(0), 0);
   if(!KeyboardHook)
   {
      
   }
}

void UnInstallHook(void)
{
   if(KeyboardHook)
      UnhookWindowsHookEx(KeyboardHook);
   KeyboardHook = 0;
}

void Minimize(HWND hwndDlg)
{
   NOTIFYICONDATA NotifyIconData;
   ShowWindow(hwndDlg, SW_HIDE);
   memset(&NotifyIconData, 0, sizeof(NotifyIconData));
   NotifyIconData.cbSize = sizeof(NotifyIconData);
   NotifyIconData.uID = 123;
   NotifyIconData.hWnd = hwndDlg;
   NotifyIconData.hIcon = HIcon;
   NotifyIconData.uFlags = NIF_ICON | NIF_MESSAGE;
   NotifyIconData.uCallbackMessage = WM_APP + 123;
   strcpy(NotifyIconData.szTip, "TrayTip");
   Shell_NotifyIcon(NIM_ADD, &NotifyIconData);
   SetTimer(hwndDlg, IDM_TIMER, 2000, 0);
   InstallHook();
}

void UnMinimize(HWND hwndDlg)
{
   NOTIFYICONDATA NotifyIconData;
   ShowWindow(hwndDlg, SW_SHOW);
   memset(&NotifyIconData, 0, sizeof(NotifyIconData));
   NotifyIconData.cbSize = sizeof(NotifyIconData);
   NotifyIconData.uID = 123;
   NotifyIconData.hWnd = hwndDlg;
   NotifyIconData.hIcon = HIcon;
   NotifyIconData.uFlags = NIF_ICON | NIF_MESSAGE;
   NotifyIconData.uCallbackMessage = TRAY_MESSAGE;
   strcpy(NotifyIconData.szTip, "TrayTip");
   Shell_NotifyIcon(NIM_DELETE, &NotifyIconData);
   UnInstallHook();
}

void SetBaloonTip(HWND hwndDlg)
{
   NOTIFYICONDATA  NotifyIconData;
   memset(&NotifyIconData, 0, sizeof(NOTIFYICONDATA));
   NotifyIconData.cbSize = sizeof(NOTIFYICONDATA);
   NotifyIconData.uID = 123;
   NotifyIconData.hWnd = hwndDlg;
   NotifyIconData.hIcon = HIcon;
   NotifyIconData.uFlags = 0x10;
   NotifyIconData.uTimeout = 15000;
   NotifyIconData.uCallbackMessage = TRAY_MESSAGE;
   strcpy(NotifyIconData.szInfoTitle, "KeyKiller");
   strcpy(NotifyIconData.szInfo, "Your windows keys shouldn't work!");
   strcpy(NotifyIconData.szTip, "TrayTip");
   Shell_NotifyIcon(NIM_MODIFY, (NOTIFYICONDATA *)&NotifyIconData);
}