Hi i wanna ask about the visual studio.net iwanna 2 know wat the deatils 2install it ?

i want to know wat the relationship between virtual cd and installing visual studio.net .another thing any one has asite 4 the installing & its deatils plz send the url .and another thing is so important i dont have the sources of visual studio.net or virtual cd but i download virtual cd from the net & iwant to do the same with the vs.net is it right thing or i must buy their cds plzzz send me & thnx so much.