Express won't power on?

    After plugging my express in the back of my computer, I check to see if it is being recognized in My Computer.  It does not show a USB Device being attached.  On my toolbar it does have the icon showing it is plugged in.  I double-clicked on it and went to properties.  I followed the instructions to reinstall driver.  Message said a driver had been found.  I clicked Next only to see a message saying installation was interrupted because a functional driver was not identified.   I am totally lost as to what to do.  Any suggestions or help would be appreciated.  Do I need to install a driver or select one or is my MP3 player bad?