Fix Microsoft Security Essentials Won't Install Errors in Windows 7

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I recently found myself having problems installing Microsoft Security Essentials on a friends PC. After several attempts to uninstall and install it getting the same error I stepped back and had to take a break.

Fix Microsoft Security Essentials Installation Erros

I ended up using Google to search for a solution. After several hours trying the MS fixes, deleting registry entries and re-booting I was stuck at the same error, that is until a friend gave me a small batch file that would remove all MSSE entries in the registry and files on the OS. Thew following is the batch file.

cd /d "%ProgramFiles%\Microsoft Security Client"

setup.exe /x

TASKKILL /f /im MsMpEng.exe

TASKKILL /f /im msseces.exe

net stop MsMpSvc

sc delete MsMpSvc

REG DELETE "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\MsMpSvc" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Security Client" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Microsoft Antimalware" /f

REG DELETE "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current Version\Run\MSC" /f

REG DELETE "HKEY_CLASSES_ROOT\Installer\Products\4C677A77F01DD614880F352F9DCD9D3B" /f

REG DELETE "HKEY_CLASSES_ROOT\Installer\Products\4D880477777087D409D44E533B815F2D" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Microsoft Security Client" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{774088D4-0777-4D78-904D-E435B318F5D2}" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{77A776C4-D10F-416D-88F0-53F2D9DCD9B3}" /f

REG DELETE "HKEY_CLASSES_ROOT\Installer\UpgradeCodes\1F69ACF0D1CF2B7418F292F0E05EC20B" /f

REG DELETE "HKEY_CLASSES_ROOT\Installer\UpgradeCodes\11BB99F8B7FD53D4398442FBBAEF050F" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\4C677A77F01DD614880F352F9DCD9D3B" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\4D880477777087D409D44E533B815F2D" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UpgradeCodes\11BB99F8B7FD53D4398442FBBAEF050F" /f

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UpgradeCodes\1F69ACF0D1CF2B7418F292F0E05EC20B" /f

takeown /f "%ProgramData%\Microsoft\Microsoft Antimalware" /a /r

takeown /f "%ProgramData%\Microsoft\Microsoft Security Client" /a /r

takeown /f "%ProgramFiles%\Microsoft Security Client" /a /r

REM Delete the MSE folders.

rmdir /s /q "%ProgramData%\Microsoft\Microsoft Antimalware"

rmdir /s /q "%ProgramData%\Microsoft\Microsoft Security Client"

rmdir /s /q "%ProgramFiles%\Microsoft Security Client"

REM Stop the WMI and its dependency services

sc stop sharedaccess

sc stop mpssvc

sc stop wscsvc

sc stop iphlpsvc

sc stop winmgmt

REM Delete the Repository folder.

rmdir /s /q "C:\Windows\System32\wbem\Repository"

sc stop

EXIT

Simply select and copy this to a blank notepad and save with the extention of .bat. Run as Administrator and let the script finish. Once completed re-boot and attempt to install MSSE again if all went well you should not get any errors.

I found this batch file helpful and wanted to share it with my readers. However I take no responsibility if problem arise utilizing this file. Use at own risk, Remember to backup and set a restore point prior to using this batch file for added protection.

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