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Error code 800F0900 when installing Vista SP1

Posted on 2009-04-03
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Last Modified: 2012-05-06
Hi all,
I'm getting error code 800F0900 when installing Vista SP1 using the standalone installer.

When I try to install using Windows Update it will not download (stays at 0%) and eventually times out with the same error code above.

One suggestion I found said to try installing the Windows Update readiness tool (KB947821) first.  I tried installing this but it stalls while installing the update.

Another suggestion I found on the net said to do an inplace upgrade.  I want to avoid this especially since this is an HP system with no Vista CD so I don't even know how to do an inplace upgrade.  Also don't want to re-install the Apps.

Any suggestions?
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Question by:mr-frank
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by:swift0
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Are you using Vista 64 or 32 bit?

The 800F0900 error seems to come from a possible corruption in mmcico.dll. What I recommend doing is download the Vista SP1 from Microsoft, and simply run it that way, rather than using Windows Update. Get SP1 here:
http://www.microsoft.com/downloads/details.aspx?FamilyId=B0C7136D-5EBB-413B-89C9-CB3D06D12674&displaylang=en
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by:swift0
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by:mr-frank
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It is 32bit Vista.

Already tried Vista SP1 standalone installer from Microsoft as stated in question and same error code appears while installing it as going the Windows Update route.
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I ended up doing an in-place upgrade (repair install) using a vista home premium oem dvd and was able to install service pack 1 after that.

Hope this helps someone else.

Katon
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