Cfg.dat is a dangerous file, which should never be left running on the system. If you noticed this file, your PC might be infected with a browser helper object that is known as Timbar A. This program is not a significant threat. However, it can be used for various questionable activities. It can be set to collect information about people's browsing habits, monitor their messages, display different pop-up ads and cause redirects to infected websites. So, when Cfg.dat is on your computer, you can easily become a victim of privacy-related issues.
The clearest sign showing that Cfg.dat has infiltrated your machine are continuous system's slow downs and annoying pop-up ads. If you started noticing them, check the system with a help of RegCure Pro.