Ok we have been in touch with Konami and with the release of the demo we are publishing the PES 2012 system requirements so you can check that you can play it.
Note that these PES 2012 system requirements may still be adjusted...
PES 2012 Minimum system requirements
OS: Windows XP SP3, Vista SP2, 7
CPU: Intel Pentium IV processor 2.4GHz or equivalent
GFX: NVIDIA GeForce 6600 or ATI Radeon x1300
GFX RAM: 128MB of RAM, Pixel shader 3.0, DirectX 9.0c compatible video card
PES 2012 Recomended System requirements
CPU: Processor Intel Core2 Duo 2.0GHz or equivalent
GFX: NVidia GeForce 7900 / AMD ATI Radeon HD2600
GXF RAM: 512MB of RAM, Pixel shader 3.0, DirectX 9.0c compatible video card
So its pretty low requirements all round really. However, once you get your hands on the full version be sure to get back here and update your FPS etc on our RATING page