A few things to try first. Open folder options....mine are set under the general tab , "show preview and filters" and not the "classic windows". Take a read at this site below for more help such as resetting the folder options and resetting the registry keys. ( Don't forget to set a system restore point). If you go this route.
Delete and Reset Windows Vista Folder Views or Folder Types Settings to Default Clean State » My Digital Life
It seems you are not alone with this problem so if you do get anything to work let us know, you will no doubt make someone else's day.
Good luck!