SQL 2005 need to change named instance back to default

I went through the upgrade process from SQL 2000 to 2005 and got an error during the database services portion so the upgrade supposedly rolled back. Once we fixed the error we were not allowed to re-run the setup (which the instructions told us to do) because the instance was already installed. We could not go back to the old version either as it in essence wasn't there. The only option we could come up with was to create a new instance. Now we have two instances and would like our new one to change to the default one. We have mission critical data that has to be accessed by Monday morning so any help is greatly appreciated.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
you cannot change the name of a instance, or from/to default.
you have to reinstall sql server for that.
biotecAuthor Commented:
So how can you uninstall the old instance or do you have to uninstall the whole SQL 2005 install which then wipes out all your jobs and dts packages etc. etc.
Guy Hengel [angelIII / a3]Billing EngineerCommented:
you will need to backup all your databases, so you can restore them later in the new instance.
you do NOT need to uninstall an instance to install another one, note that you can happily install instances of different versions/editions side by side.
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biotecAuthor Commented:
One more question. I noticed that through add/remove programs that you can repair or remove and it gives you instance options. Is it possible to just remove one instance without affecting the other instance? Thanks
Guy Hengel [angelIII / a3]Billing EngineerCommented:
>Is it possible to just remove one instance without affecting the other instance? Thanks
yes, perfectly. each instance is a 100% distinct installation of sql server, and can be managed distinctly, which includes deinstallation.

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Microsoft SQL Server 2005

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