No Disk Insert ???

[Ch@os]

What the hell for a disk i bought that on steam do i really have to install a no cd patch on a bought version ? or is there an other solution ?

solution : you dont have to have any cd in your drive than it works wird bug

[Coconut Head]

This game currently has many problems that prevent it from working. I really wish someone would fix it.

[Reaver]

I had a similar problem with Red faction 2, turns out the game was trying to read the cd in my drive. Once i took it out the game worked. This may be the same problem you are having