Trojan-Downloader.Agent-DN is a dangerous Trojan, the existence of which can lead not only to slow computer performance, but also poses a serious threat to privacy. Trojan-Downloader.Agent-DN opens a gateway through which other malware can be downloaded to your computer. This creates a possibillity that sensitive personal information will be stolen. It will also definitely lead to massive amounts of annoying pop-up advertisements, which will considerably slow down the system.
Trojan-Downloader.Agent-DN is a threat and should be removed upon detection.