In Windows 2000, such can be caused by a disk error that the OS can't handle. To recover from such we save what we can with tools available. I may even use a KNOPPIX CD to boot and copy such out.
I am getting this message when trying to access one folder on an external hd when all the others are working.
I would like to know how to either access from another route and/or copy the files to another location for fixing.