I got this malware on my machine last week while I tried to run my FaceBook on Firefox (http://ubuntuforums.org/showthread.php?p=6765488 )
This linescan6 malware will give you prompt that all of your HDD are infected by Trojan(i had like around 57 trojan on C and some trojans on drive D.), and it also prompts you to download binary files
FED UP! I tried to download my Forefront Client and tried to install it as a standalone (without server) in my vista x64 machine.
Steps:
1. Open command prompt(type cmd on your start menu)
2. Redirect your cmd to folder of Forefront client folder. example: C:\Users\xxxxxx\Desktop\en_forefront_client_security_x86_x64_cd_x13-62435\CLIENT\X64
3. Type clientsetup.exe /NOMOM
4. Update your latest Forefront updates from internet. (updates need to be run on IE) :)