Suatu kali, pernah laptop bos saya dan komputer warnet rekan saya muncul peringatan tentang validasi keaslian Windows yang mereka gunakan. Fitur itu adalah Windows Genuine Advantage, yang bisa disingkat WGA. Setelah akhirnya dibantu oleh paman Google, saya ingin membagikan sedikit trik yang saya gunakan kepada rekan saya dan juga bos saya untuk menghilangkan peringatan WGA yang biasanya muncul di pojok kanan bawah pada system tray Windows.

Langkah2nya adalah sebagai berikut :

1. Buka Task Manager dengan Ctrl+Alt+Del
2. Matikan proses yang bernama “wgatray.exe”
3. Restart/reboot komputer dan masuklah ke dalam safe mode
4. Pada safe mode, buka registry editor ato regedit melalui menu Run. Ketik regedit kemudian enter
5. Pada regedit, carilah HKEY_LOCAL_MACHINE\SOFTWARE\microsoft\windowsNT\CurrentVersion\Winlogon\Notify, kemudian hapus folder/directory “WGALOGON”
6. Restart kembali komputer seperti biasa…

http://l3nk.wordpress.com/2007/08/29/menghilangkan-pesan-windows-genuine-advantage-wga/================================================================

Jendela Genuine Advantage (WGA) pemberitahuan terjadi ketika komputer Anda tidak lulus uji validasi. Tes validasi bisa gagal karena yang dijual salinan (non-asli) bajakan XP, atau karena anda sudah mengubah kunci produk XP ke kunci perangkat lunak yang dihasilkan, atau kadang-kadang itu hanya terjadi tanpa alasan sama sekali. Validasi digagalkan menginstal tiga jenis pemberitahuan-pemberitahuan di komputer Anda: satu di log di layar, satu log di timer, dan satu balon. Ini juga berhenti update dari Microsoft dan melumpuhkan kemampuan untuk menginstal IE7 dan Windows Media Player 11. Solusi ini dapat menyingkirkan dari ketiga pemberitahuan, meskipun Anda masih tidak akan dapat memperbarui melalui Windows Update. Anda tidak akan dapat men-download sesuatu dari Microsoft yang memerlukan lisensi yang valid.

Edit Steps

Delete Method

1. 1
   Jika Anda baru saja diinstal pemberitahuan Windows Genuine Advantage, hanya menggunakan fungsi system restore akan menghapus program. Lalu menolak untuk menerima WGA update waktu berikutnya Windows update. Jika tidak, lanjutkan sebagai berikut. (CATATAN: Jika Anda mencoba langkah-langkah sementara Anda berada di "Safe Mode," langkah # 8 tidak perlu).
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2. 2
   First, try the following:
3. 3
   Open a Command Prompt window by clicking on Start -> Run. Type CMD and press OK.
4. 4
   Change Directory into the System32 Folder (type cd \windows\system32)
5. 5
   Open a Notepad window and type the following lines:
   • taskkill -IM wgatray.exe
   • del wgatray.exe
   • del wgalogon.old
6. 6
   Highlight and copy the three lines above to the Clipboard.
7. 7
   Paste the contents of the Clipboard to Command Prompt.
8. 8
   This should kill the wgatray.exe process from the Taskbar and immediately delete both files wgatray.exe and wgalogon.dll without the need to to go through all steps bellow.
9. 9
   If that does not work, follow the steps below:
10. 10
    Open System32 by either of the following methods:
    
    
    • 

      Click "Start" -> "Run", then type "system32".
      Click "Start" -> "Run", then type "system32". Click "Okay".
    • Find system32 manually by clicking "Start" > "My Computer" > "(C:)" (or whatever your drive letter is) > "WINDOWS" > "system32".
      
11. 11
    In "system32", go to "Tools" > "Folder options", click on the tab, "View", and uncheck "Hide extensions for known file types" if it is not already.
12. 12
    Check to make sure the window that comes up has a full screen of various files. The files are in alphabetical order, which makes it easier to locate the specific file.
13. 13
    

    Find "WgaLogon.
    Find "WgaLogon.dll" and rename it "WgaLogon.dll.bak".
14. 14
    Create an empty copy of WgaLogon.dll:
    
    
    • 

      Right click on a blank space in system32 and select "New" > "Text Document".
      Right click on a blank space in system32 and select "New" > "Text Document".
    • Leave the text document empty and label it "WgaLogon.dll". Press Enter (on your keyboard).
    • 

      You may get a warning from the above step that says, "If you change a file name extension, the file may become unusable.
      You may get a warning from the above step that says, "If you change a file name extension, the file may become unusable. Are you sure you want to change it?". Click "Yes" on this warning.
15. 15
    Be ready to complete the next two steps very quickly! Find "WgaTray.exe" in "system32" and delete it. You will then have 5 seconds to find "WgaTray.exe" in the Task Manager (the next step). NOTE: If you remove the files mentioned above while you are in "Safe Mode," step #8 is unnecessary.
16. 16
    

    Immediately open Task Manager.
    Immediately open Task Manager. Anda dapat melakukan ini dengan menekan Ctrl, Shift, dan Esc secara serempak, menekan Ctrl, Alt, and Delete keys simultaneously, atau klik kanan Taskbar dan memilih "Task Manager". Klik pada tab proses dan klik proses berakhir ketika "WgaTray.exe" dipilih. Catatan: Jika Anda mengambil lagi, jangan panik! Semua yang akan terjadi adalah bahwa "WgaTray.exe" akan tetap muncul kembali dalam daftar proses (yaitu Anda tidak akan mampu menghapusnya seperti yang diperlukan). Untuk menghapus pemberitahuan setelah ini, kembali ke system32. Anda akan menemukan dua file:"WgaLogon.dll.bak" (the one you renamed) dan Ekstensi Aplikasi (0KB) yang disebut "WgaLogon.dll". Hapus Ekstensi Aplikasi, mengubah nama "WgaLogon.dll.bak" to "WgaLogon.dll" and repeat the steps from the fifth one onwards (at a greater speed!!).
17. 17
    Restart your computer once you have finished. All the notification messages should be gone.

Rename Method

1. 1
   Open a CMD window by clicking on Start -> Run -> type CMD and click OK.
2. 2
   Open a Notepad window (Start -> Run type NOTEPAD click OK) and type or copy (select the lines, and then press Ctrl-C) the following lines and paste (Ctrl-V) into the Notepad window:
   • CD %systemroot%\system32
   • rename wgatray.exe wgatray.exe.bak
   • rename wgalogon.old wgalogon.old.bak
   • rename LegitCheckControl.dll LegitCheckControl.dll.bak
   • taskkill /F /T /IM wgatray.exe
   • del wgatray.exe.bak
   • del wgalogon.old.bak
   • del LegitCheckControl.old.bak
3. 3
   Make sure there is a blank line at the end of the text document, right after the last line.
4. 4
   Select all the text (Ctrl-A) and copy to the clipboard (Ctrl-C)
5. 5
   Paste the clipboard into the CMD Window (right click -> Paste)
6. 6
   This should kill the wgatray.exe process and delete the files it uses.

• • • if the there are not the above files(wgatray,...) in your system32 folder, then simply search for wga in the windows folder .you will find wga related files in a folder with the name "KB905474" that has been added during a windows update.delete the said folder and restart your PC.
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Here is my steps: Same as above "CMD" and go to c:\windows\system32 steps A). type the command:

taskkill -IM wgatray.exe
  
  followed by "Enter" to run the command

B). Under Windows to delete files: wgatray.exe, wgalogon.old because access denied
Mouse point go to "Start" --> right click --> Explore --> go to C:\windows\system32 Find the files: wgatray.exe wgalogon.old
Select those two files by left tick first one and hold shift key down left tick second file
Then right click mouse and a menu will pump up, select "CUT"
Go to desktop, and right click mouse, select "Paste". The files wgatray.exe wgalogon.old have been moved to desktop.
Select wgatray.exe wgalogon.old on desktop and delete files.

Edit Tips

• This process will only get rid of the notifications, and will not validate your copy of XP. It will remove the timer at the beginning of your XP log on, the white notice on the log on screen, and the annoying yellow star that appears in the bottom right corner of the screen.
• This is easier to do if you have someone reading the steps to you while you do it.
• You may need to Find Hidden Files and Folders in Windows to get to System32 manually.
• If task manager processes are moving, click the title of the "image name" row to freeze them.
• If you are having problems after this, disable the updates before rebooting.
• There is a program called RemoveWGA which does all of this for you. Just run the program, click yes, and you're done. (See External Links, below.)
• If you have problems changing files in the system32 directory, you will have to turn off System Restore. Go to "Start" -> "Control Panel" -> "System" -> "System Restore" and check the "Turn off system restore" check box.
• You will not be able to use Automatic Updates anymore; instead, you have to manually update them. In External Links, there is a program that will allow you to update any system, regardless of if it is genuine or not.
• You can also rename WgaTray.exe to WgaTray.exe.bak if you can't remove WgaTray.exe from your Taskbar. Press Ctrl+Shift+Escape to do so.
• It will be useful to have Task Manager open first before deleting WgaTray.exe
• Unlocker is a free program that can assist in removing WGA notifications.