I've got a little problem. ^_^

When I tried to install Fallout 3 it said something like "CANNOT LOCATE THE CD-ROM/DVD-ROM Please insert the correct CD-ROM/DVD-ROM, select OK and restart application" So I right-clicked on the icon and explored the dvd. There I saw the 'Setup' icon... The installation went well. The problem is that when I want to play it showes the same message: "Cannot locate the CD-ROM..."
What should I do in order to make the game... start?

Thank you!

Get FOSE. You can play the game without a disc once you install it. If you want to get into using any mods you're going to need it anyway.