Windows 8, both client and server editions will provide additional security capabilities against malware. Specifically, Microsoft provides guidelines for anti-malware and other security solution developers to develop security solutions to protect early boot components from malware. For instance, the Measured Boot feature provides anti-malware software with a trusted (resistant to spoofing and tampering) log of all boot components that started before anti-malware software. The Early Launch of anti-malware software feature provides a Microsoft-supported mechanism for anti-malware software to start before all other third-party components.
Download the information about the early boot protection features for Windows 8 operating systems here - http://msdn.microsoft.com/en-us/library/windows/hardware/br259097.aspx