Open regedit and Navigate to
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run and delete the string value “RESTART_STICKY_NOTES”
Note: This settings applies until you open Sticky Notes, if opened this registry string will be automatically created. To fix this deny permission (for Run key) for you account as shown below (Right click on Run and select Permission).
Also note that this settings will block other StartUp applications since permission for Run is denied.
Or Sticky Notes can be completely disabled via msconfig (StartUp and UnCheck StickyNot.exe).