msi REINSTALL

Check out the example below

Save (use notepad) the bolded text below with a .bat extension . Call the .bat file from command prompt.


@echo off


    if not exist "C:\Program Files\MS\myClient" goto INSTALL


ECHO UNINSTALLING MY CLIENT
msiexec /x myClient.msi /qn
ECHO UNINSTALLATION COMPLETE
 goto INSTALL


   :INSTALL
ECHO INSTALLING MY CLIENT
msiexec /i myClient.msi /qn      
 ECHO INSTALLATION COMPLETE