Summarize:

The Device Setup Wizard will display on-screen after your MP3 player is detected, and you can begin using your MP3 player. If the Device Setup Wizard doesn’t pop up after connecting the walkman to your computer, proceed with the following steps to download and install necessary software drivers.   Device information and available software drivers will display on-screen. At this time, Sony Walkman MP3 drivers are only available for Windows-based computers. There may be one or more drivers available depending on the model of your MP3 player.  ”  When complete, your computer will recognize your device and you can begin using your MP3 player.
Connect your Sony Walkman MP3 player to your computer using a USB cable. Wait for your computer to recognize the MP3 player. Navigate to Sony’s support website at http://esupport.sony.com/p/select-system.pl?DIRECTOR=DRIVER. Select “Walkman MP3 and Video MP3 Players” from the Product Category list. Select the model of your MP3 player from the Model list. Select the operating system for your computer. Click on “Drivers,” then click on “Download” to the right of any available drivers. Click on “Download Now” to the right of the driver description. Review Sony’s Software Agreement, then click on “Accept Agreement. Select the option to save the driver .exe file to your computer’s desktop. Double-click on the .exe file, then follow the on-screen prompts to install the drivers for your Sony Walkman MP3 player.