Geforce 2 mx 400 and sis 315

i have P4 2 ghz and 256 mb . i have geforce 2 mx 400 .most games works properly and it say it is geforce2 mx 400 agp.

but the problem is that i cannot update my graphic driver . when i download from nvidia site(forceware) , it says it is not compatible with the hardware.and i noticed that the one of the file my driver uses is sisgrp.sys (somethin like that) which i think is related to sis cards .and moreover my card doest have microsoft digital signing.
 
Try updating the motherboard drivers first? Looks like you have some SiS chipset there.
 
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