When i download it , it wont start ... ???

Can u help please ?

You need to install it and set it up properly. Have you had a look at Anubis' DOSBox Tutorial yet?

I just fixed everything

the only problem is, how do i save stuff, so i dont have to type in,

Mount c C:\dos

every time ????

You don't have to mount your C-Drive every time. Just follow the steps in Anubis' tutorial.