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.
DownloadPlus is an adware spyware that serves unexpected pop-up advertisements, usually with pornographic content. It also shows undesirable weather reports. The threat can be installed by some insecure web sites or may get into the computer along with some spywares. DownloadPlus is able to update itself via the Internet without asking for user permission.
Technical details (How to remove DownloadPlus(pop up))