I am having a similiar problem. i Have a canon mx700 and all im trying to do is install the simple drivers. everytime i go through the install process. it stops and says; Fax driver is currently in use. if you are not using the fax driver,it may be used by other users on this computer. Exit all applications and fax dialogs then try again.
If you still have problems, restart your computer.
I did all that and restarted uninstalled anything to do with Canon on my Computer. nothing running. This stupid warning still comes up.
i press ok and then the installation failure window comes up.
I press start over and it all starts again.