Connection to a computer

Cannot install the software.
The progress bar on the install screen does not proceed. Or, the access lamp of the hard drive does not light for several minutes.
[Connected USB. The player cannot be operated.] or [Connected USB (MTP). The player cannot be operated.] does not appear when connected to the computer with the USB cable (supplied) (The computer does not recognize the player).
Data cannot be transferred to the player from your computer.
The transfer takes too long time.
Only a small amount of data can be transferred to the player.
Cannot return a song on the player to the computer.
The player becomes unstable while it is connected to the computer.