You seem to have a very outdated firmware. I would recommend you to update to our latest for your product.
For this you need to download a file, and then put in on a USB-stick and then update your Playon!HD Essential.
You have a direct link for the download here -> http://www.acryan.com/downloads/PV73500 ... ropean.zip
Then update using these steps:
Safe-mode flashing procedure:
1. Download and extract the .install.img and bin.wifi.zip into the root folder of a USB-stick. Make sure the USB-stick is formatted to FAT32.
2. Insert the USB-stick to your player.
3. Shutdown the player.
4. Press and hold down the power button in front of the player for 15 seconds.
5. Your player will restart and install the new firmware.
When you connect the Playon!HD Essential with USB-slave to your PC. It will act like any normal USB-harddrive connected to your PC. You can then access your files and folders just the way you have arranged them in your hard drive. Just browse the hard drive and if you have music files in the hard drive they should be located..
If this is not the case, please let us know what OS (operative system) you are using on your PC, is it Windows 7, Windows XP, Windows Vista, MAC iOS, Linux etc?