1.
when you want play
only Multiplayer from MoW you can download/install the free copy from MoW.
this Men of War game client (free of charge) include 1.17.5 patch + languagepack + hotfix.
http://www.gamershell.com/download_58730.shtml
note: this MoW version works only with a legal bought CD-Key.
2.
have you test your CD/DVD on other pc's? sometimes other pc's can read your "damaged" CD/DVD.
ask a friend making a copy (for installation) from your original game CD/DVD.