Thus, you must be very careful when running any files downloaded from the World Wide Web! Always read the User Agreement, Software License and Terms of Use carefully. Because more often than not, adware can be bundled with the installation files of Softonic, Cnet, Soft32, Brothersoft or other similar software download websites. The adware software was probably installed on your machine when you installed certain free software such as Email checker, PDF creator, video codec, etc. How does DesktopActivity get on your computer Spyware can seek out your privacy data stored on the MAC, gather this information and use it to steal your identity. Does adware software steal your data? Adware can also be spyware.