Oracle 19c installation stuck at creating and starting oracle instance
Two of the most common reasons for the Oracle DB installation to get stuck at this point are:

inability to write to %TEMP% directory (usually as a result of AD domain policies or a full disk)
virus check software (other than Windows Defender) interfering with the installation process

If you need to cancel the installation and try again, be sure to confirm that the %TEMP% directory on your Windows box does not have any leftover directories prefixed with deinstall, OraInstall or CVU, as these may be reused by future installations, creating a different set of issues.