I have had the same wikt Internet explorer 5.5

below is een document from microsoft with the problem.

 Article ID: Q250867

Cannot Install Service Pack 6/6a with High Encryption Internet Explorer

The information in this article applies to:
* Microsoft Windows NT Workstation versions 4.0 SP6, 4.0 SP6a
* Microsoft Windows NT Server versions 4.0 SP6, 4.0 SP6a
* Microsoft Windows NT Server, Enterprise Edition versions 4.0 SP6,
4.0 SP6a
* Microsoft Windows NT Server version 4.0 SP6, Terminal Server Edition

SYMPTOMS
If you attempt to install the standard-encryption (or 56-bit) version of
Windows NT 4.0 Service Pack 6 or 6a on a Windows NT 4.0-based computer that
already has Microsoft Internet Explorer High Encryption Pack or Internet
Explorer version 5.5 installed, you receive the following error message:
        You have chosen to install a version of the Service Pack with
Standard Encryption onto a system with High Encryption. This is not
supported. To successfully install this version of the Service Pack, you
must install the High Encryption version. Press Help for more information
about obtaining the High Encryption Version of this Service Pack. Service
Pack Setup will now exit.
CAUSE
This issue occurs because the Schannel.dll file that is installed by
Microsoft Internet Explorer High Encryption Pack and Internet Explorer 5.5
cannot be overwritten by the service pack installation program.

Internet Explorer 5.5 includes 128-bit encryption by default because of the
United States government's recent decision to allow companies to export
products that use strong, 128-bit encryption.

Windows NT 4.0 Service Pack 6 and 6a were released before this decision was
made. Therefore, localized versions of Service Pack 6 and 6a are 40-bit
versions. 40-bit versions of these service packs detect higher encryption
levels and do not allow themselves to be installed.
RESOLUTION
To work around this issue and prevent the version-number scanner from
comparing the Schannel.dll file versions:
        Use any text editor (such as Notepad) to open the Update.inf file in
the I386\Update folder in the service pack source files.
        
        Place a semicolon (;) before the reference to the Schannel.dll,
Security.dll, and Ntlmssps.dll files in the [CheckSecurity.System32.files]
section of the Update.inf file.
        
        Save and then close the Update.inf file.
        
        Install the service pack.
        
Additional query words: 56 bit sp6 sp6a
Keywords : kberrmsg kbsetup

> -----Oorspronkelijk bericht-----
> Van: Pesek Wolfgang (Mail) [SMTP:WPesekCOUNCIL.NET]
> Verzonden: woensdag 25 april 2001 17:56
> Aan: FOCUS-MSSECURITYFOCUS.COM
> Onderwerp: Windows NT High Encryption
>
> I run a Windows NT Server Enterprise Edition (German Language) box with
> SP6a (Standard Edition afaik 56bit).
>
> As soon as i install Office 2000 the box is changed to High Encryption
> (128bit). Thats the first thing that puzzles me - due to the fact that i
> can not remember any options during Setup concerning this topic.
>
> Buit the real problem is the following. After adding WINS and DNS Services
> it is recommend to reinstall the ServicePack. But that simply can not be
> done !
>
> ServicePack Setup terminates with an error like this : "This Machine is
> installed for High Encryption. Please install the right ServicePack"
>
> When i try to install a High Encryption ServicePack i encounter following
> message : "This Machine is installed in a wrong language"
>
> But afaik there is no HighEncryption ServicePack available for German
> Windows NT Server!
>
> So can someone give me some hints how to get rid of the HighEncryption or
> point me to some aid ??
>
> Thanks a lot
> and best regards,
>
> Wolfgang Pesek
> Technical Administration
>
>

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