I was completing an installation of a single-tier TFS system today.  Another contractor thought he was going to just get it installed with a click-click-next-next.  Anyway, to make a long story shorter, the SQL Server install was completely wrong to meet the TFS needs.  So, my inclination was to re-image the server, but that would not be available until the next day.  Relunctantly, I opted to do an uninstall/reinstall of SQL Server.  I have tried this in the past to no avail.  Today would be different, right?  Yes and no.

 The SQL Server reinstall went pretty good.  I got through 80% of the TFS install when I get this message:  Error 29105.Team Foundation Report Server Configuration: The SQL Reporting Services databases were not created.  Retry?

Someone made the C: drive 2 GB on this server;  I don't know why, but it is.  Has this killed me?  Oh no, six hours of work down the drain, just when I was feeling pretty good!

Nope.  Turns out, SQL Server leaves the database files in place when you uninstall it.  This makes sense.  The reporting files are still there and the install does not want to overwrite them.

In my case, I got it install by deleting the following files from the SQL Server data directory.