This happened to me because I installed MMSQL Server and then I had to uninstall it and re-install because I had the collation wrong. But during one of the pre-installation checks that SQL Server runs it come up with:
“Reporting Services Catalog Database File Existence” failed
“Reporting Services Catalog Temporary Database File Existence” failed.
To fix this problem we need to delete some files that the SQL Server uninstaller must miss for some reason.
Navigate to “C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA” then delete the following files:
ReportServer.mdf
ReportServer_log.LDF
ReportServerTempDB.mdf
ReportServerTempDB_log.LDF
Once you have deleted the files hit the re-run button on the pre-installation check and it will pass.
Now your problem should be resolved just continue on with your install.
