win32/sirefef.bc aka ZeroAccess.b!env Trojan vs Windows Firewall on Windows 8 : How to Fix

Last night i encounter a trojan called win32/sirefef.bc. It's also known as ZeroAccess.b!env by McAfee. It has been around for 4 months for now.
It happens in Windows 8 32 bit operating system, which i suppose there's a flaw in Windows 8 security.
Although i am also at fault here, since i turned off the UAC and exclude my C:\ drive from Windows Defender scan list.