What does this permission indicate...

I run a vbs script on several machines. All has worked except for one
machine. The script essentially performs a backup via WinZip and places the
result in a shared folder.

When I then try to copy the script from the master station, this one
workstation gives me an 'access denied' message. I am running as
administrator on all machines. By the way, I'm running XP Home /SP2 with
Norton AV , and I run SptBot-Search & Destroy. No indicated problems.

I looked at the permissions on the shared folder and I noticed something on
this workstation that I have never seen on the other workstations on our
private lan:

NT AUTHORITY\NETWORK SERVICE:(special access:)

DELETE
SYNCHRONIZE
FILE_READ_DATA

If I remove file sharing on this folder and then re-apply file sharing, this
entry disappears (and my network copy works fine). Furthermore, if I go
into safe-mode and look at the permissions, it says that this item is an
'unknown user'.

What is Win XP trying to tell me? I have never seen this type of permission
before.

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