I deleted Google Settings App
Google app is supposed to be built into system/app I wonder how you managed to uninstall it, unless you have root access.  Anyways! What you can do is Download the stock firmware image for your device from the vendor's site and flash it in your device! All the things will be reverted back to default and normal !!
 I don't know which Xperia you're using with Android ICS so I won't be able to provide you with links and tuts. Good Luck!!