Hi @Lore_22, welcome to the community! Your qwery was translated to English, since this is a international forum.
I'm sorry to hear that. For me to be able to assist you in the best way possible, could you please provide me with a bit more information on how you are trying to transfer your data, and what kind of data you want to transfer?
When connecting your phone to the computer with a USB-cable, you must put your phone in Media Transfer Protocol (MTP) mode, a file transfer mode. When a USB-cable from your computer is connected to the phone, you should get the options to choose what you want to use the USB connection for. Choose File Transfer (MTP). You should now be able to find your phone in your computers file explorer, but you can also use the function Browse Xperia in Xperia Companion, our free computer program and access files in your phone. From here you can copy or move them to your computer.
Please keep me updated and have a nice day! 
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