Go to search by the start button and type system information.
The screen that pops up will tell you all about what you have. Share it with us via a screen shot.
Have you validated the System, yet?
Where did you download the ISO from? Double check the link for the ISO download. There are instances where the ISO download can get corrupted and you end up having a bad install. Redownload ISO from here and then reinstall.
Official Windows 7 SP1 ISO from Digital River « My Digital Life