On another forum a very helpful person named XEN posted this tip for this
problem - and it worked! Here it is:
Windows Installer CleanUp Utility solved my problem when I could not
reinstall MSXML6:
http://support.microsoft.com/kb/290301
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"Samual" wrote:
> I have been advised by technical support at Mindjet that in order to resolve
> a problem (XML Processing Error) I have had (other people came into the
> discussion saying they were having the same problem) with Mindjet Mindmanager
> since installing XP service pack 3 a few days ago that I need to reinstall
> MSXML6.msi. I have downloaded MSXML6.msi but cannot install it due to the
> message "The system administrator has set policies to prevent this
> installation". Mindjet said they could not help me with this. I have XP
> Media Center
> Edition v5.1 build 2600.xpsp.080413-2111 sp 3. I have done some research and
> found some information about modifying the group policy for Windows
> Installer. Using gpedit.msc under Computer Configuration/Administrative
> Templates/Windows Components/Windows Installer I enabled "Disable Windows
> Installer" and set it to "Never". Also "Enable user controls over installs"
> and set it to "Enable". Also "Prohibit User Installs" and set it to "Enable"
> and "Allow User Installs". Unfortunately I'm still getting the same message
> about "poliicies prevent this". This is my home computer and not on a
> network. I've been dealing with this for about a week and not really sure
> what to do from here. Any help would be appreciated. Thank you.
>