Try opening it by using right click > explore.
And by the way do you keep files in thumbnail mode?
More commonly, you may have pulled the plug on the drive while it was still writing - always use the "safely remove hardware" icon to power down and disconnect the drive before removing it.Try another USB plug. Use one on the back of the computer, it would be the best. This has been known to sometimes work.Try to plug in the USB drive before you turn on the computer. Or if you've done that - try to plug in the USB drive after the computer is on.
Check> Go to device manager , open the USB controllers , If you find one with a yellow check mark, uninstall it , then rescan for hardware changes - Windows should reinstall the USB driver at this point.