As far as I know, there aren't any applications out there that let you do an auto install with a normal version of W7. I've seen non-legit versions that do so or at least rumored to do so. Not sure if this site works with W7, but you can check it out:
If your looking to do a normal install of windows 7 unattended you can use the Windos Automated Installation Kit which you can get from the microoft site on the link below. That should let you set up a fully automated installation and run it.