Windows cannot boot, unless there is a DVD rom

I have a problem with Windows XP and this is my latest experience. I finished up my installation of Windows XP sp3… after I turned off the CPU and I unplug the DVD ROM, when I restart the computer it will not boot into Windows but restart continues.
This makes me wonder, after I plug it back to the DVD ROM. It can boot Windows and there is no master in DVD. I already uninstalled and reinstalled 3 times. But still problematic as above.
