Modern Warfare Won't Launch after patch

Desktop App Tech Support
1

Modern Warfare update…now the game won’t get past Desktop App launch screen…great job patching

3
  1. Setup the patch
  2. Run the patch installation
  3. Play and enjoy it.
4

Not sure how to do this. 2 days ago I got on and it took FORVER to load up the patch . I can login into COD modern warfare but all of the games fail to load . it wont let m e join a game. where is th e patch?