Penumbra Black Plague - disc can't read

[Linda123]

O.K. sorry I didn't explain my problem properly...I am using windox xp home edition....I have even gotten the disc replaced through the store where I bought the game. Same problem with second disc...it keeps saying can't read disc in time allowed....I have only been able to actually launch the game once since I installed it....I was hoping someone may know why the discs are having this issue .....thanks...