file named system was damaged

i remove hard disk from motherboard,then install it in my pc,install winxp pro,everything is ok.
i get it back to another pc,asked somebody else to update hardware device,but he failed ,he told me that winxp report erroe when startup.the follow file \windows\system32\config\system was damaged.i try to reslove it,the problem still exist,could you tell me how to correct it?
the key is hardware device?
thanks