minimum:
CPU: Minimum: Intel Pentium D 2.8 GHz or AMD Athlon 64 X2 4400+
RAM: Minimum: 1 GB RAM (1.5 GB required for Windows Vista/Windows 7 users)
OS:Minimum: Windows XP/Windows Vista/Windows 7 (Latest Service Packs)
Video Card: Minimum: NVIDIA GeForce 7800 GT or ATI Radeon X1950 Pro or better
HDD:12GB
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reccommended
CPU:Recommended: Intel Core 2 Duo 2.4 GHz or AMD Athlon 64 X2 5600+ 2.8 GHz
RAM: Recommended: 2 GB
OS:Recommended: Windows Vista/Windows 7 (Latest Service Packs)
Video card: Recommended: NVIDIA GeForce 260 or ATI Radeon HD 4870 or better
Video RAM 512 MB
source: http://www.systemrequirementslab.com/cyri/