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What if you boot on safe mode and try again?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Click on the link on my last post or if you are on lollipop
http://talk.sonymobile.com/t5/Software-Updates/Lollipop-New-Features/m-p/955490#U955490
There have been problems in the past with the inbuilt option, we always recommend file commander.