Penumbra Black Plague - disc can't read

[Linda123]

I have been trying to play this game now for a couple of weeks. I just finished Penumbra Episode One...(great game)...after much frustration I took my computer in to be checked...had virus scan, updated memory and video-graphics card...left the game at the computer shop but they even couldn't get it running....it loads without issue but when I try to play it keeps saying it can't read the disc in the time allowed - please try again - if I try again still nothing happens...does anyone else have this problem and if so were you able to correct this issue? Thank you for any help.....