here are plenty of kiosk software available to do this, I have used and can recommend SiteKiosk although I can't say if it is better or worse than others.
Many of the different vendors offer Free Trials, so check a few out
There also is OpenKiosk, an Open Source alternative.
Another real good choice appears to Webconverger which claims to be a Browser Only Operating System. In practice it appears to be a micro-linux, and I am not sure what customization is available.
googled lock down kiosk windows 7 and found these softwares. Seems legit and pretty solid.
Internet Kiosk Pro (http://www.emailarms.com/products/internet_kiosk.html)
Advanced Internet Kiosk (http://www.softstack.com/advink.html)
Secure Lockdown (http://shop.inteset.com/Products/21-lock-down-windows-7-and-run-internet-explorer-as-a-customized-kiosk-application.aspx)
Sitekiosk (http://www.sitekiosk.com/SiteKiosk/Default.aspx)
Or as Dark mentioned in the comments, there is a built in Kiosk mode into WIndows 8.1. If you can put this project on hold until the official release, this may give you the functionality that you're wanting without having to purchase third-party software.
Take a look at Windows SteadyState and Opera kiosk mode. You can lock down as much as possible with group policy then install SteadyState. If someone manages to get by all the policies and out of kiosk mode from Opera, simply reboot the machine to restore everything.