creat a file called autoexec.cfg and put it in the crysis dir
paste this in it and save
sys_spec = 1
sys_spec_Full = 1
sys_spec_ObjectDetail = 1
sys_spec_Shading =1
sys_spec_VolumetricEffects =1
sys_spec_Shadows = 1
sys_spec_Texture = 1
sys_spec_Physics = 1
sys_spec_PostProcessing = 1
sys_spec_Particles = 1
sys_spec_Sound = 1
sys_spec_Water = 1
sys_spec_GameEffects = 1
sys_spec_Quality = 1