I bought this game recently on gog.com and it installs fine,but when I'm in the menu's and trying to start single-player or tutorials,the game tells me that there is NO-CD and I have to Retry or Cancel,I have found that pushing the cancel button works to boot up the game in single-player but not when I try tutorials. is there anyway I can fix this?

Having the same problem here and its bugging the hell outta me .

What do you mean?

I just tried running it in Admin mode and it doesn't fix it :/

I'm going to resurrect this thread from the grave as no solution was actually offered back in 2012.

I'm now finding I have the same problem, 7 missions in!

The game was working just fine up until today, but now when I try to reload a previously saved game I occasionally receive the "no-CD" message.

Needless to say it's incredibly frustrating!

I've tried uninstalling and reinstalling the game to no avail.