volume access

hi everyone , couple of days ago i got a disturbing error which prevent windows 7 64bit pro to start. After i startup pc i get this error : Error: Cannot open volume for direct access. Autochk cannot run due to an error caused by a recently installed software package. use the system restore...

I can see the usb Hard drive on all the lists. my computer and the device manager but it does not show any volume and when I go to click on the icon to ppull it up the drive the task par just shows a very slow progress on teh green line and never stops searching. any clue on what to do? This...