Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
TurboDownload is a typical adware application that shows annoying advertisements without asking for user permission. It can be installed by unsafe web sites or ad-supported software. The infection symptoms are constantly appearing pop-ups or web browser windows containing commercial advertisements. TurboDownload also may modify some computer settings and violate user privacy.
Technical details (How to remove TurboDownload(pop up))