Windows 7 Upgrading from 7000 to 7057

I recently tried upgrading to the most recent build but ran into an issue. I've downloaded the ISO and verified it burnt properly a few times but it still doesn't seem to work. What happens is that if I boot from the DVD and choose the upgrade option it tells me I need to be in Windows to do it. The problem I have there is that when I run the Setup.exe it tells me that it can't find autorun.dll. I'm not sure if it's even possible to do a simple upgrade to 7057 without a complete reinstall but I wanted to find out what I could be doing wrong.