I can't end wgatray.exe by task manager nor delete it by using shift+delete havig said I 've already opened C:windowssystem32wgatray.exe.

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1. Open a Command Prompt window by clicking on Start -> Run. Type CMD and press OK.
2. Change Directory into the System32 Folder (type cd \windows\system32)
3. Open a Notepad window and type the following lines:
   • taskkill -IM wgatray.exe
   • del wgatray.exe
   • del wgalogon.old
4. Highlight and copy the three lines above to the Clipboard.
5. Paste the contents of the Clipboard to Command Prompt.

1. 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".
     
     
2. 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.
3. 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.
4. Find "WgaLogon. Find "WgaLogon.dll" and rename it "WgaLogon.dll.bak".
5. 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.
6. 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.
7. Immediately open Task Manager. Immediately open Task Manager. You can do this by pressing the Ctrl, Shift, and Esc keys simultaneously, pressing the Ctrl, Alt, and Delete keys simultaneously, or right clicking the Taskbar and selecting "Task Manager". Click on the process tab and click end process when "WgaTray.exe" is selected. Note: If you take longer, do not panic! All that will happen is that "WgaTray.exe" will keep reappearing in the processes list (i.e. you won't be able to delete it as required). To remove the notifications after this, return to system32. You will find two files:"WgaLogon.dll.bak" (the one you renamed) and an Application Extension (0KB) called "WgaLogon.dll". Delete the Application Extension, rename "WgaLogon.dll.bak" to "WgaLogon.dll" and repeat the steps from the fifth one onwards (at a greater speed!!).