Question : An error occured during logon username administrator domain companyweb Event 537

companyweb, for no apparent reason cannot be accessed from the server but its fine with all the clients

When I open Internet explorer, I am presented with a username and password box, so I put in my login details (Administrator + password) its comes back again with

companyweb\administrator and a blank password field, which I fill in again, and press okay and it just keeps looping

event log is

Logon Failure:
Reason: An error occurred during logon
User Name: administrator
Domain: companyweb
Logon Type: 3
Logon Process: Èù
Authentication Package: NTLM
Workstation Name: VLC-PDC
Status code: 0xC000006D
Substatus code: 0x0
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: 192.168.16.2
Source Port: 3546

Company web is being used by all the users so uninstalling isnt an option.

anyone know the answer to this?

Answer : An error occured during logon username administrator domain companyweb Event 537

IT WORKS NOW but only with this registry change from

http://support.microsoft.com/kb/896861

Method 2: Disable the loopback check

I would prefer the more secure Method 1 option to list the server alias??? Maybe im missing something in this context.
I didnt reboot when trying Method 1 only IIS Admin Restart but I rebooted after Method 2 so that may be a factor. Please let me know if you get Method 1 working!

THE REAL QUSETIONS HERE ARE: WHY DID THIS START HAPPENING ALL OF A SUDDEN? IS IT RELATED TO TREND MICRO WFBS UPOGRADE/INSTALL?

                       
             Windows Registry Editor Version 5.00
 
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa]
"DisableLoopbackCheck"=dword:00000001

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