afcad doesnt work...

i have fs2004
when i start afcad an error pops up and says ..AFCAD.exe has encountered a problem and needs to close. We are sorry for the inconvenience. this happens everytime. i have Xp sercive pk 1.
when i start afcad an error pops up and says ..AFCAD.exe has encountered a problem and needs to close. We are sorry for the inconvenience. this happens everytime. i have Xp sercive pk 1.