We got different error messages when upgrading from SQL 2008 RC0 to RTM. The first one is “The following error has occurred: Not Found. Click Retry ….” While installing SqlRSConfigAction_upgrade_shutdowninstance_cpu64 (See attached screenshots). Nothing happened when clicked on retry so I had to did click on Cancel. The installation moved forward but then it returned another message “The process cannot access the file C:\Windows\system32\perf-ReportServer-rsctr.dll because it is being used by another process” Same behavior upgrading a x64 cluster sql2008 Ent Ed on Windows 2008, x64 standalone Ent Ed on Windows 2008, x86 sql 2008 Dev Ed.