STAAD Pro is the professional’s choice for steel, concrete, timber, aluminum and cold-formed steel design of low and high-rise buildings, culverts, petrochemical plants, tunnels, bridges, piles and much more!
"For working on vista and win 7 simply right click the " setup.exe" file and select "Run as administrator".All other informations are given in it."
For those who already have the installation files here are the instructions
Install Instructions(For Vista & Win 7)
Here is the link for staad pro 2007.
“IF you have any doubts regarding the installation just post a comment,i am ready to help”