wmmiexe.exe error

I am getting the error “wmmiexe.exe has generated the error and will be closed by windows” after getting this error my cpu usage goes on 100%. After few seconds i get the blue screen Driver_IRQL_NOT_LESS_OR_EQUAL Begining dump of physical memory. I have windows 2000 professional machine with service pack 4 and Antivirus program. Can any body give me let me know how to fix this error. Thanks