1 dosbox.sourceforge.net (
www.dosbox.com)
the only one and the official
by the way, sourceforge is a website dedicated to free and open source software, made usually very well and it beats commercial competitors of same branch. the only exception i can think of is photoshop, which is better than free gimp. it also provides a lot of mirrors in case some server were down. you can not go wrong with sourceforge
2 after installing dosbox, run it and type "intro", it will give you brief instructinos. also
this is a good place to start too. and some of
common vista issues
3.
http://tinyurl.com/22c6t