Recently, I've been havng issues syncing my iPod nano (7th generation). I thought the most logical way to fix this is to restore it. When I click "Restore" everything is fine till it gets to "Extracting Software" then it says "The iPod "Alex's iPod nano" can not be restored because it is in use with another application." I do have warranty. Should I take it to the Apple Store?
Is the Enable Disk Use option enabled from under the iPod's Summary tab in iTunes? If so, disable it and then try restoring again.
Sometimes simply rebooting the iPod and Mac can resolve the issue. To reset the Nano, press and hold both the Sleep/Wake and Home buttons together long enough for the Apple logo to appear.