So you want to install TFS 2012 and stuck in Advanced Configuration Wizard?
Don't worry! I'll give you a hand here.
While installing Team Foundation Server on your machine, you can encounter this error, even though SQL Server is installed:
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The problem is; you're referencing a previous version instance or other instances such as SharePoint.
How to solve it?
Get back to SQL Server Instance configuration page and change the SQL Server instance:
for example : developer
"developer" is my instance name for Database, Reporting, Integration and Analysis Services, while "developer\sharepoint" is my SharePoint server 2010 instance.
Note the instance name where these services are installed.
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And now our TFS installation can continue for the configuration.
Problem solved!