You have to make Disinfection in order to be able to open your folders.
First of all go to http://www.precisesecurity.com/tools-resources/adware-tools/flash-disinfector/
And You'll see Download Here:
<<<< Hit it
Save it to your Desktop
Now Turn OFF any Antivirus.
Connect the wire of iRiver X20 MP3 Player to your computer.
Go to "Flash Disinfector" on your desktop, and double click it. Hold on 10 seconds the screen will disappear, then everything will work properly.
Now you can open your folders, but you are highly recommended NOT to only disinfect it but also to remove it, because it's a trojan virus that calls autorun.inf << generic trojan horse that affect your AutoRun of the drives.
Run Your explorer as Administrator and
Go to http://www.bitdefender.com/scanner/online/free.html
do Online scanning. It will automatically detect the trojan and any other virus in case this trojan is worm and affected other files, so everything will be removed automatically.
Also, you are highly recommended to restart your PC when the Online Scanner is done.
This will work 100%