SQL Server Setup Issue : How to resolve Reporting Services Catalog Database File Existence Failed or Temporary Database File Existence failed
When you Uninstall SQl server some of the traces will be left behind one of them are Reporting serivces catalogs in order to fix this issue follow the screen shots below
You can delete those file from following location
C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA
Hope this help !