download it first ?

yes i downloaded it than i searched through the files and couldnt find DOSBox.exe

as you don't post your operating system I assume that you are windows user
the file is called
DOSBox0.72-win32-installer.exe

i got windowsXP and there is no file instaler.exe either there are only lots of files which cannot be opened

Are you sure you downloaded DosBox using this link: http://prdownloads.sourceforge.net/dosbox/DOS … er.exe?download?

i tried it on my other computer and it works i dont know whats wrong with the first computer

computer broken maybe

Use the Find/Search feature (of Windows XP), can't remember the name in English, that's useful when you don't know where you downloades/saved a file.