Can you try installing MSXML2 version 3 after the other install?
The 'r' DLL is just a resources file with things like error messages that 
are localised.

-- 

Joe Fawcett (MVP - XML)
http://joe.fawcett.name
"Michael Portner" <pisaura@f...> wrote in message 
news:7917brF1oebj2U1@m......
> Hi together,
>
> I don't know whether this is the right thread for my problem but perhaps
> anyone can help me.
>
> I just installed the electronic exam preparation software (Microsoft Press
> Readiness Review Suite) from the original Microsoft Training CD that
> comes with the book "Managing and Maintaining a Microsoft Windows
> Server(TM) 2003 Environment" (70-290).During installation the this first
> error comes up:
>
> "The Windows Installer service cannot update the system file
> C:\WINDOWS\system32\msxml3r.dll because the file is protected
> by Windows."
>
> The installation continues after confirming the error message with OK.
> Unfortunately there are further errors when I try to start the
> application.While starting the application the error in this next error
> is shown:
>
> Window title: "Application Error"
> Window text:
> "Error Number: 1000
> Error Source: frmMain.MDIForm_Load
> MDIForm:Load
> [MsLocalWare] [429] ActiveX component can't create object"
>
> When I choose "StartNew Test" from the "Test" menu the third error
> appears:
>
> Window title: "Microsoft Press Readiness Review Suite"
> Window Text:
> "Run-time error '91':
> Object variable or With block variable not set"
>
> Closing this error causes the whole application to quit.
>
> I searched for information about the error in the internet but couldn't
> find any suitable hints. The Microsoft Knowledgebase contains
> articles concerning ActiveX errors but not exactly with this application.
>
> I tried to use the software with "Windows XP SP3" as well as with
> "Vista Ultimate SP1" - in both cases the sameerrors appear. Both
> operating systems are the German version.
>
> I think the basic error is the first one concerning the file msxml3r.dll.
>
> I've already tried to install several versions of Microsofts MSXML Parser
> and even updated the msxml3r.dll seperately by turning off system file
> protection.
>
> What shall I do to solve the problem?
>
> Thank you for your efforts!
>
>
> Best regards,
> Michael
>