SQL 2008 upgrade error

I receive an error when upgrading a SQL instance from 2000 to 2008. "The following error has occurred: One or more command-ilne switches were invalid."
I've tried to upgrade using the 'upgrade from SQL 2000 or 2005' option in the installation media.

Screenshot attached, thanks John screenshot
RBG ITAsked:
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Aaron ShiloConnect With a Mentor Chief Database ArchitectCommented:
could you please post the summary.log file
RBG ITAuthor Commented:
where can I find the summary.log file? I've searched for it but can't locate it.

Aaron ShiloChief Database ArchitectCommented:
it should be under the sql server folder in Program files
Daniel_PLConnect With a Mentor DB Expert/ArchitectCommented:
Please look in %programfiles%\Microsoft SQL Server\100\Setup Bootstrap\Log\
In file summary.txt please find for 'error' or 'failed' messages.
RBG ITAuthor Commented:
I've installed the DB on another server.

Thanks for your help.
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