@echo off

taskkill /IM sidebar.exe /F 2> NUL
for /F %%i in ('dir /B "%LOCALAPPDATA%\Microsoft\Windows Sidebar\Gadgets\FritzBoxTraffic*.gadget" 2^> NUL') do (
   RD /S /Q "%LOCALAPPDATA%\Microsoft\Windows Sidebar\Gadgets\%%i"
)