first go to download.com
search on the top paint.net, then this should come up(click down load)
next is all you have to do is just put save archive(my computer is set to spanish language so i have put translate)
then when it says download done double click the paint.net winrar archive
then this should come up(even if you didn't buy winrar yet it still works) then drag the screen icon thingy to the desktop and whenever you click on it shoul come out the program.