Http error on windows NT

Hi.

I have recently configured HTTP on our domino server. till morning the http worked fine, then, whenever i restart the domino server or try to use tell http quit it hangs.

when i start the domino server following error coming… " the instruction at “0x100a7038” refrenced memory at “0x000000” the memory could not be " read " click ok to terminate the application.

pls help me