I am having a display issue with window. ?

I was downloading APB on my IMac but this IMac is bootcamped I have Windows XP SP 2 on one side and Mac OS X 10.4.11 on the other. I was dowloading APB and suddenly the power cord was knocked out of the socket (French socket with US adapter). I went to start it up and the display on the windows side no longer works. I went to Mac and the display is fine. I went back to windows XP and I get the loading screen to start and then when the login page comes up it goes black. I have tried starting in safe mode and it always stops on Mup.sys for some reason. I have tried restoring to an earlier period in time still ends up black. I need to know how to fix this is my work here.