I have just completed a virgin install of Windows 2000 Server/ Isa
Server/Exchange Server 2000 with all relevant updates/patches applied.
Installation and updates proceeded without error however I am now getting the
following error logged about once every five minutes.

Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1000
Date:  26/04/2007
Time:  5:24:56 PM
User:  NT AUTHORITY\SYSTEM
Computer: W2KSERVER
Description:
Windows cannot access the file gpt.ini for GPO  The file must be present at
the location <>. (). Group Policy processing aborted.

I have also discovered that I cannot open the Domain Controller Security
Applet or the Domain Security Applet [Error messages say "Failed to open the
Group Policy Object. You may not have appropriate rights].

I have gone made countless Microsoft searches and found a whole host of
oblique refefences to this problem but nothing in quite the same context.
None of the proposed methods of resolution worked. I Googled this error and
found quite a few others with the exact same problem in identical
circumstances to mine but nobody seened to ever post any solutions to this
problem.

I am at a loss as to how to proceed.

This seems to be an entirely Microsoft Issue as no third party software is
involved and everything was installed using "standard" options. Surely
somebody knows how to resolve this - I hope so anyway.

The results of DCDIAG follow:

-------------------------------
DC Diagnosis

Performing initial setup:
  Done gathering initial info.

Doing initial non skippeable tests
 
  Testing server: Default-First-Site\W2KSERVER
     Starting test: Connectivity
        ......................... W2KSERVER passed test Connectivity

Doing primary tests
 
  Testing server: Default-First-Site\W2KSERVER
     Starting test: Replications
        ......................... W2KSERVER passed test Replications
     Starting test: NCSecDesc
        ......................... W2KSERVER passed test NCSecDesc
     Starting test: NetLogons
        ......................... W2KSERVER passed test NetLogons
     Starting test: Advertising
        ......................... W2KSERVER passed test Advertising
     Starting test: KnowsOfRoleHolders
        ......................... W2KSERVER passed test KnowsOfRoleHolders
     Starting test: RidManager
        ......................... W2KSERVER passed test RidManager
     Starting test: MachineAccount
        ......................... W2KSERVER passed test MachineAccount
     Starting test: Services
        ......................... W2KSERVER passed test Services
     Starting test: ObjectsReplicated
        ......................... W2KSERVER passed test ObjectsReplicated
     Starting test: frssysvol
        Error: No record of File Replication System, SYSVOL started.
        The Active Directory may be prevented from starting.
        ......................... W2KSERVER passed test frssysvol
     Starting test: kccevent
        ......................... W2KSERVER passed test kccevent
     Starting test: systemlog
        ......................... W2KSERVER passed test systemlog
 
  Running enterprise tests on : DOMAIN
     Starting test: Intersite
        ......................... DOMAIN passed test Intersite
     Starting test: FsmoCheck
        ......................... DOMAIN passed test FsmoCheck