Você precisa ativar a virtualização (processadores AMD-V para AMD). Segundo no documento da placa-mãe (na seção 3.4.1 Configuração da CPU ) isto está em Configuração da CPU / Máquina Virtual Segura.
Cool ‘n’ Quiet
Use this item to enable or disable AMD’s Cool ‘n’ QuietTM technology. The default value is [Auto]. Configuration options: [Auto], [Enabled] and [Disabled]. If you install Windows® 7 / VistaTM and want to enable this function, please set this item to [Enabled]. Please note that enabling this function may reduce CPU voltage and memory frequency, and lead to system stability or compatibility issue with some memory modules or power supplies. Please set this item to [Disable] if above issue occurs.
Secure Virtual Machine
When this option is set to [Enabled], a VMM (Virtual Machine Architecture) can utilize the additional hardware capabilities provided by AMD-V. The default value is [Enabled]. Configuration options: [Enabled] and [Disabled].