Some of u guys clearly dont no a thing about PCs, the main reason why u need vista for DX10 is becos vista supports 64 bit processing where as XP only supports 32 bit, it needs 64 bit so it can control more than a couple of things at one time, eg: sky boxes for crysis are one object but with DX10 they are each different layers which can change, 32bit processing has trouble handling this so it needs 2x the power, 64bit, vista. It will make ur PC run slower but XP should be able to handle it if you have PCI Express and not AGP graphics ports.
MEEILZ
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