Is my CD corrupt

[hoho330]

Receantly i tried to install my copy of Myth 2. But when i choose large install so i can play multiplayer the install crashes when it gets to about 40%, giving me a error about not being able to copy international large install tag. When i try to copy the file to my computer it says that acces is denied or somthing. is my copy ruined?(it does look quite scratched but i've seen worse work)

[hoho330]

ps: when i tried to install it first i got the windows NT problem. when the installer is run in compatibility mode i get the aformentioned problem.