NTFS permission to delete files, but not delete or move folders

[Guest]

I am having issues with users, on a file share of Windows 2000 Server, where
some of the users are accidentally moving folders.

I have given them rights to delete/update/write files, but am having trouble
taking away the rights to delete folders, subfolders, or to move those same
folders, while still having the rights to delete/update/write files.

Can someone tell me what the correct permissions should be set to allow a
user to do anything they want with the files, possibly allow them to create
sub folders, but not allow them to delete or move subfolders.

Thanks in advance
Gordon