NW6 SP5 with NSS post SP5 fix.

We have large NSS volumes with about 500,000 student files. Very
occasionally students place folders or files into their home directories
that can;t seem to be deleted. On this volume I have three such files. If I
try to delete them I can get error messages saying for folder or file names
are too long or corrupt. I recall years ago when we were on NW5 or 5.1 I
used to get this and would delete the files by going through nwadmin or
sometimes to a map to their drive and delete through a command prompt.
However now I cant seem to shift them!

Any ideas?