After failing to install bootcamp, when re booting I receive an error

After partitioning my hard drive it asks me to insert a authentic windows cd and hit continue, I did, after that it brought me out of OSX to a black screen, my mac ejected my windows disk and it said something like: "please insert bootable disk and push any key" it says this whenever I reboot, to avoid this hold down the option key and it allows me to select OSX, how do I prevent it from happening when I normally just reboot?

Thanks.