@echo off
setlocal EnableExtensions EnableDelayedExpansion
title Fix Microsoft Defender Update Error 0x80070002

:: =========================
:: ADMIN CHECK
:: =========================
net session >nul 2>&1
if %errorlevel% neq 0 (
    echo.
    echo [ERROR] Please run this script as Administrator.
    echo.
    pause
    exit /b 1
)

echo ==================================================
echo Microsoft Defender + Windows Update Repair Script
echo Safe mode - No registry or driver changes
echo ==================================================
echo.

:: =========================
:: STOP SERVICES
:: =========================
echo Stopping Windows Update services...
net stop wuauserv >nul 2>&1
net stop bits >nul 2>&1
net stop cryptsvc >nul 2>&1
net stop msiserver >nul 2>&1

:: =========================
:: RESET UPDATE CACHE
:: =========================
echo Resetting update cache...

if exist "%windir%\SoftwareDistribution" (
    ren "%windir%\SoftwareDistribution" SoftwareDistribution.old
)

if exist "%windir%\System32\catroot2" (
    ren "%windir%\System32\catroot2" catroot2.old
)

:: =========================
:: DEFENDER CHECK
:: =========================
set DEFENDER="%ProgramFiles%\Windows Defender\MpCmdRun.exe"
if not exist %DEFENDER% (
    echo.
    echo [ERROR] Microsoft Defender not found.
    echo Script aborted safely.
    echo.
    pause
    exit /b 1
)

:: =========================
:: RESET DEFENDER DEFINITIONS
:: =========================
echo Resetting Defender definitions...
%DEFENDER% -RemoveDefinitions -All >nul 2>&1

echo Updating Defender signatures...
%DEFENDER% -SignatureUpdate

:: =========================
:: RESTART SERVICES
:: =========================
echo Restarting services...
net start cryptsvc >nul 2>&1
net start bits >nul 2>&1
net start wuauserv >nul 2>&1
net start msiserver >nul 2>&1

echo.
echo ==================================================
echo DONE.
echo Defender definitions refreshed and update cache reset.
echo A reboot is recommended but not mandatory.
echo ==================================================
echo.

pause
exit /b 0