Share your experience!
Repair your phone with PCC and do NOT install any antivirus or taskillers
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
One thing that you could try before following uliwoolys suggestion, is to boot the phone into safe mode to see if you experience the same behaviour:
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008