The sigh wasn't really directed at you. But we do get this kind of question pretty often now, and it ought to be even more often in the future.
First, please
read this.
DOSBox is a program which simulate a DOS platform within Windows. With it, you will be able to play any DOS game just as if you actually had DOS installed on your system.
You will no doubt have other questions, but I'll wait for you to specificaly voice them before givign you too much to absorb in one go.