You cannot upgrade/repair from Beta to RTM. You will need to uninstall Beta
and install RTM. You cannot connect to existing Db's as they are not
compatible i.e. there is no upgrade path for the data. ASAIK though you
should be able to export your customisations from beta and inmport those
into RTM, but the data is a no-no.
Incidentally, I was not aware of the import limitations for leads in Beta -
I will take a look at mine and see if this occurs.