Call of duty 4

Hello,
ive been having some problems, with single and multi player, for cod4. it says for both of em , that it didnt quit, properly and to run it in safe mode, so i did, then it says my com. has changed since the last time i played cod4, and it asks if i wanna keep my setting and controls the same and i said yes. then it says that directx has found an unrecoverable error, and then t says to read the readme, but theres nothing there. OMG. ive tried fricking everything. ive uninstalled and installed cod4 and directx thusands of times,and the worst thing is. im trying to join a clan, and if i dont play, i cant join the clan. i need some help pronto, plz help.
from,
BOOMHEADSHOT