Virtualization is supported by the CPU and the motherboard as indicated here:http://dlcdnet.asus.com/pub/ASUS/mb/SocketAM3+/M5A97_LE_R2.0/E7460_M5A97_LE_R2.pdf
I would recommend that you make sure that the motherboard has the latest Bios and then enable Virtualization within the BIOS only without the use of any 3rd party software.
I've fixed it with Hotfix Windows6.1-KB2519949-x64.
bios set : Advanced → CPU Configuration → SVM Enable.
Virtualization Supported, Disabled
But XP Mode works.