when i turn on my ipod (idontknowwhatkindofipodis) a message appear, it said "contact with www.apple.com/support/ipod
Where did you receive this message about contacting Apple support? Was this on the iPod's display? What it a sad face icon as seen in this article?
iPod displays a sad iPod icon
With the iPod still connected, have you tried a hard reset? To do this, press and hold both the Select (Center) and Menu buttons together long enough for the Apple logo to appear.
Are you plugging the iPod into a high powered USB 2.0 port and not a USB hub?
Retrieving data ...