I have the DELL Inspiron 580 desktop computer with configuration Intel Core i3, NVIDIA GeForce GT220, 4GB RAM, 256GB HDD, and Windows XP. This desktop computer is used everyone in my family and it is use for various purpose like programming, gaming and internet(surfing, downloading,etc) as well. The antivirus use is the Norton 30days trial version. Recently, norton gave the alert "Trojan-Downloader.Dadobra.CP is found". I am not able to remove this malware. Please tell me how to remove??