In my point of view the easyest way of installing dosbox is to install DosBox Game Launcher that comes with an up to date dosbox 0.65 cvs. The only thing you need is java. Other advantages of DBGL is that starting games and settinp them up is just so easy. You can get it from here
http://home.quicknet.nl/qn/prive/bla.../dbgl/#install
good luck