When migrating from SCVMM 2008 Beta to the final release bits (RTM), a utility is required in order to complete the process successfully. This tool is no longer posted on the Microsoft 'Connect' site, but is still available by request from Microsoft Support. The name of the utility is 'upgradev2beta.exe'.
Migrating from VMM 2008 Beta to VMM 2008
http://technet.microsoft.com/en-us/library/cc764282.aspx