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uninstall all the apps on 1. and also enable all the apps, most likely you have disabled something that you weren't supposed to
1. yes
2. yes
3. no
4. same problem
5. almost all
if that doesn't work then repair your phone with either
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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