DB.ini is a configuration file, which is used to store essential settings of programs and their components. Usually, these settings describe standard programs' behavior, their functionality and additional features. By deleting such file, you can stop the essential application or disable some of its functions, so it's not recommended.
DB.ini file can also be involved to malicious activity. According to security experts, this file may be related to Virus Doctor. Similarly to legitimate DB.ini version, the malicious its version is used for storing essential virus settings. Although such cases are quite rare, you should thoroughly examine DB.ini. For that we recommend using RegCure Pro.