I had to mention this amazing free cd emulator controller provided by Microsoft located here
This is such a cool software with size under 60kb, just unzip the file to the location you want and run the exe file in it.
Now you can add any number of drives you want and mount all the image files you want. The best part it’s free and fast.
Only limitation is that it does not work with Vista and there is no support for this.
But it’s way lighter and faster then any of the other supposed “free” emulators.