點樣玩唔到單機版call of duty 4

我click入去想玩singleolayer
佢話It appears that Call of Duty 4 :Modem Warfare did not quit properly
the last time it run
Do you want to run the gime in safe made?
This recommmend for most people it will changer your system
settings but not your controls
唔明佢講咩-.-
有冇人可以幫下我...