SQL Server 2012 installation Reporting Services Catalog error

I'm installing SQL Server 2012 at the moment and when I was about to run the installation, this error pops up:

On clicking the first failed test, which is "Reporting Services Catalog Database File Existence", this is what i get:

On clicking the second failed test, which is "Reporting Services Catalog Temporary Database File Existence", this is what i get:

So basically, both of the message box says me that "Catalog Database File" & "Catalog Temporary database files exists". Because of this, i need to select Reporting Services file-only mode installation.

My questions are:

1. How do i select file-only mode installation?
2. Do i've to close the setup and do something and afterwards run the setup again?

Btw, I had SQL Server 2012 installed before. I uninstalled it completely due to some strange errors and decided to reinstall a fresh copy of SQL Server 2012 and now I'm stuck with these errors. Any help will be sincerely appreciated. :)

Since you already had one installation of SQL Server done before, there was a database already created. That did not get removed. So when you reinstall, its trying to create the database with the same name, hence, the error. You need to delete the old files to continue the new installation.

> From the direcotry

> C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA

> Remove the following files

> * ReportServer.mdf

• ReportServer_log.LDF
• ReportServerTempDB.mdf
• ReportServerTempDB_log.LDF

Try the Following link for further help.

Reporting Services Catalog Error.

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For [tag:sql-server-2012] the path is:

C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQL2012\MSSQL\DATA

where MSSQL2012 is the instance name and the respective file names are:

• ReportServer$MSSQL2012.mdf

• ReportServer$MSSQL2012_log.mdf

• ReportServer$MSSQL2012TempDB.mdf

• ReportServer$MSSQL2012TempDB_log.mdf

Remove the following files from the C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA directory:

bulletReportServer.mdf
bulletReportServer_log.LDF
bulletReportServerTempDB.mdf
bulletReportServerTempDB_log.LDF.

This happens if you reinstall SQL Server and these files weren't deleted.