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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
ID: 24062204
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
ID: 24063145
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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mr-frank earned 0 total points
ID: 24120477
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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