install this file?

i downloaded the 230MB file but its just like a DOS window that opens for a few seconds doesnt actualy do anything... the file size isnt exactly 230 mb it is 227mb, i had to restart cause of my internet crashing - stupid ntl... could this have caused a problem?

any clues?

should i restart the PC? is there a way around it? have i done somthing totaly wrong?