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System Requirements

Minimum System Requirements

CPU: Intel Dual core/AMD Athlon 64X2 or better
RAM: 2G or better
VGA: nVidia Geforce 8600GT/AMD Radeon HD4600 or better
HDD: 15GB
OS: Windows XP (Service pack 2), Vista, Win7 (32bit / 64bit), Windows 8 (32bit / 64bit)
DirectX: 9.0c

Recommended System Requirements

CPU: Intel Quad core/AMD Phenom II X4 or better
RAM: 4G or better
VGA: nVidia Geforce 8800GTX / AMD Radeon HD4850 or better
HDD: 15GB
OS: Windows XP (Service pack 2), Vista, Windows 7 (64bit) , Windows 8 (64bit)
DirectX: 9.0c

Windows 8.1 is currently not supported yet so downgrade to Windows 8 or previous versions so you can play. I will post here if BnS China fix the issue about Windows 8.1 compatibility issue.