How to remove autoit.fl worm

Hello, I have a problem with some kind of virus. Eset NOD32 found it.Help please … One man told me that this is a rootkit, new .. And I do not know how to remove it…anyone have some idea? Thank You

ESET NOD32 Antivirus 4
Threat found
Alert
Object:
F:The Sicilian.exe
Threat:
Win32/Autoit.FL worm
Comment:
Event occurred on a new file created by the application C:WinIsass.exe
