File Permissions

I recently set up the first Vista Business computer on the network. The user
is trying to access resources on a Windows 2000 server. There is one
particular subfolder where, if they try to save files after modifying them,
the error comes back as "Cannot find the file. The connection may have been
lost. Access is denied". The user can open the files, but not save
modifications.

This does not occur with any other subfolders or files in the mapped
directory, and all files and folders are inheriting the same permissions from
the parent directory.

The user has full control over all of the files when accessing them from an
XP machine.

Please help.