You could try and install the backup-plugin for TV-Server (to keep settings and recordings etc.) and then uninstall MediaPortal AND delete the database from MSSQL. This should force recreation of the database.
ok... now the whole story... (sry forgot this because i tried too often...)
clean installation -> fails to generate gentle.config
copying back the old working gentle.config to %programdata%\...\...tv server
starting tvserver config -> unable to upgrade database
database "version" = 57
i am currently downloading 27200... will report back in 5mins
i think sth is going totally wrong for me... now tried 27200 on 2 computers... on both the gentle.config will not be generated and the DB can't be upgraded... i did a complete uninstallation of the existing MP and dropped databases... so what am i doing wrong?