MSXML 4.0 will not instal in Windows 8 64 bit

I am trying to install MSXML 4.0 sp3 in Windows 8. It starts then stops with

&quot An error occured during installation of assembly component

{74974f83-779E-3983-A06B-D6B9ABF34537}

HRESULT: 0x80073712 &quot

Hunting on the MS web site I found there was a msxml4-KB2721691-enu for 64 bit versions.

However this (even running as administrator) gave the same error

I have spent days hunting for answer on the web so obviously it is not a common problem but has certainly cropped up a few times but with no answers

Do I reinstall windows 8? Is there something to look for that might be missing? Is there a setting I have to make.

While I am not computer trained I can find my way around and usually solve my own problems. However at 71 yrs and having made the move from XP to Win 8 with all ties cut, I am feeling a bit out of my depth here.

Any help appreciated

bussoz

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