Xperia mini 17i update Android 2.3 to 4.0
You can't terminate wininit.  If their installer is trying to do so then it's broken, or trying to install a rootkit by replacing system files in use by wininit.  Normally you should have an option to ignore the warning and it will simply need a reboot after the install (though given that it's warning about a system process, I wouldn't trust it as far as I could throw it).  Did you get the installer from Sony's official site?