Cannot install due to 'The language of this installation package is not supported by your...

[dsa42]

I'm running Win7.
I have a US-English version installed.
I downloaded the Office Pro 2010 ISO but it was too big to burn to a CDROM, so I extracted it and ran the installation from there.
When I try running the setup.exe, I immediately get the error message "The language of this installation package is not supported by your system"
This link says that there will be problems installing if I do not extract the complete folder structure, but I do have the folder structures correctly extracted

http://social.technet.microsoft.com/Forums/en/office2010/thread/fc387fb0-1ad2-4945-8885-15a1d1bcdfef

Other places say there might be problems if I've tried to uninstall Office but was not able to uninstall correctly. This is a new system, and I have not uninstalled anything.
So I found the installation log file at C:\Users\<user name>\AppData\Local\Temp\SetupExe(...).log
There are a whole log of successful XML parsings, but at the end, there is the following error message (my user name is "owner"):



Parsing setup.xml file: C:\Users\owner\Downloads\OfficePro2010\Word.en-us\setup.xml
Xml Signature verification succeeded for C:\Users\owner\Downloads\OfficePro2010\Word.en-us\setup.xml
LIS: start parsing setup xml
LIS: Package File Name = WordMUI.xml
LIS: Package File Hash = E40549A3B988653E83611F4EA270DF7F
LIS: Package File Size = 1800
LIS: Package File Relative Cache Path = WordMUI.xml
LIS: Package File Relative Source Path = WordMUI.xml
LIS: Package File Name = WordMUI.msi
LIS: Package File Hash = 5921378B2BEE035BEB7FB146CA5DC89E
LIS: Package File Size = 1819648
LIS: Package File Relative Cache Path = WordMUI.msi
LIS: Package File Relative Source Path = WordMUI.msi
LIS: Package File Name = WordLR.cab
LIS: Package File Hash = C22EE85527B2A5DFB6DB537A88569969
LIS: Package File Size = 43803555
LIS: Package File Relative Cache Path = WordLR.cab
LIS: Package File Relative Source Path = WordLR.cab
LIS: Package File Name = Setup.xml
LIS: Package File Hash =
LIS: Package File Size =
LIS: Package File Relative Cache Path = Setup.xml
LIS: Package File Relative Source Path = Setup.xml
LIS: finished parsing LIS package "{90140000-001B-0409-0000-0000000FF1CE}"
Required add on group: culture does not have a complete set for descriptor: en-us for product: PROPLUS
Required add on group culture does not have a complete set of addons for product: PROPLUS
A required add on group does not have at least one full match for product: PROPLUS. Removing product from available product choices.


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What is wrong? How can I install this?

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