Hello, I'm in desperate need to remove the Sirefef trojan infecting my desktop computer. My computer is running on Windows 7 64-Bit Home Premium. I believe that I may have contracted the trojans when I downloaded a "new" video converter for my Nook. Although, I'm not entirely sure if this is the case. Regardless of the cause, I noticed the symptoms of a sirefef trojan when my Microsoft Security Essentials disabled real-time updates. I uninstalled MSE and installed a fresh MSE, however I believe this may have made matters worse. I am unable to do very much in terms of erradicating the virus as my computer keeps displaying a web browser supposedly from the FBI (Federal Bureau of Investigation, instead of Intelligence) telling me to pay a fine to unlock my completer. I was open MSE and view the of detected malware and see Sirefef and Rogue:win32/winwebsec What can I do to remove these virus?