DESKTOP ICON REPLACED BY NOTEPAD OR ANY OTHER PROGRAM?

-PRESS CTRL+ALT+DEL KEYS (CHOOSE TASK MANAGER)

-CHOOSE EXPLORER.EXE THEN END TASK

-TYPE %USERPROFILE%\APPDATA\LOCAL

-CLICK
>ALT
>TOOLS
>FOLDER OPTIONS (HERE SHOW HIDDEN FILES THEN DELETE ICON CACHE THEN HIDE AGAIN)

-CLICK
>FILE
>NEW TASK
>TYPE C:\WINDOW\EXPLORE (ENTER)

-RESTART YOUR PC