I am using Windows XP on my system and I installed the essential elements of the Microsoft. Mine essential security Microsoft has detected the Trojan Downloader on Saturday night when I was last restarted. Now I'm not able to eliminate this and my Microsoft security key is not running on my system and I get the error: Ox800705b4 code during the scan. Today when restarting mine that I have the alert saying that a team of mine is contaminated with the virus and I have to buy some tools up the PC to eliminate the virus with the error: "Downloader Trojan: Java / OpenConnection . jr. “Now I do not know what to do. Can anyone suggest to respect and to be able to resolve the problem of mines.