How to connect Sony Xperia Tipo to PC? (I have installed Sony PC Companion and I successfully transferred pictures and songs but now it is impossible).
I really don't know what have gone wrong with the program you were using. However, I can recommend you the security app that gives you the freedom of connecting Android phone with PC with its PC/Mac feature. The app name is Folder Lock developed by NewSoftwares.net
If you have problems with the Sony PC Companion, then I recommend downloading the latest version. The simplest way to fix these problems is through the software's installation. After the software has been installed, reconnect the phone, then go to Settings > Xperia Connectivity, and follow the guide.
Download page: http://support.sonymobile.com/global-en/xperiatipo/tools/pc-companion/