Installing Integration Server

As soon as I launch webMethodsInstaller461, appear this error message:

The webMethods Installer could not make contact with the
server using:
bin/dataserve2.cgi Please check your network connectivity.

what I have to do?

Can you ping from that host? If not, you probably are probably behind a proxy server. You can install by downloading the product images and performing the install using the -launchImage switch.