There are many tools to create images of CD's.
With Daemon tools you can mount them.
You can create these images with programs like Nero, Alcohol 120%, VirtualCD, etc.
Sometimes creating the image won't work bcause the CD is protected. You can then use a program like ClonyXXL to detect the protection type, then use Alcohol120% to image the CD selecting the copy protection detected by ClonyXXL.
If the game still won't load you can enable a few emulation options in Daemon tools. (you can also use Alcohol120% to mount images, btw).
If they don't work you can get a fixed image (mostly small image) from the internet.
For SafeDisc 4 protected CD's you sometimes have to use SafeDisc4 Hider.