When i conneted my player with computer then i

1.Try resetting the Walkman by pressing the RESET button located on it. It looks like a small hole. You can use any pin or any sharp pointed object to reset it.
Then connect back the Walkman to check whether it works.

2. Use the supplied USB cable to connect the Walkman to the Computer.
3. Disconnect all other USB devices if you have connected to avoid conflict.
4.Connect the Walkman to the other USB ports on the Computer.
5.Check whether the USB Driver is installed in the Computer or if it is corrupted.
You can check whether the USB Driver is corrupted or not by following steps below(only for Windows Operating System).
Right-click on MyComputer icon and select "Manage".
Then, select Device Manager at the left plane.
Then check whether any "Unknown device" or "?" or "!" is listed under Universal Serial Bus Controllers at the bottom of the right pane.
If there is so, then right-click on it and select uninstall.
This will un-install the USB Driver.
Then, un-plugg the USB cable and plug-it in.
Now, the Walkman should be recognized as a removable device in My Computer.

If the issue persists, then connect the Walkman to a different Computer to check whether the issue is with the Computer or the Walkman.

If the issue persists even with different Computer,
If the issue persists you may try using a different compatible USB cable.