I am trying to install DNN Social on my C drive for evaluation for our company.  I am following the video Chris presents at http://www.dotnetnuke.com/Resources/Video-Library/Viewer/Video/516/View/Details/DNN-7-0-Installation-Part-2-Web-Server-Configuration.aspx

I am using IIS version 7. When I try to run the rest of the installer, I get the following error message:

Error Summary
HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid. 
 
Detailed Error Information 

Module

IIS Web Core 
 
 Notification

BeginRequest 
 
Handler

Not yet determined 
 
Error Code 
0x80070021 
  
Config Error 
This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false". 
 
Config File 
\\?\c:\websites\dnndev.me\web.config 
  
Requested URL 
http://www.dnndev.me:80/ 
 
Physical Path 
c:\websites\dnndev.me 
 
Logon Method 
Not yet determined 
  
Logon User 
Not yet determined 
 
 Config Source 74: <system.webServer>
75: <modules>
76: <add name="RequestFilter" type="DotNetNuke.HttpModules.RequestFilter.RequestFilterModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>


Links and More Information This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error.
View more information »

Thanks for the suggestion.  I checked with inetmgr and it is using .net 4.0.  I also checked the permissions of the websites folder and the dnndev.me folder and they are both set to full control. I am still trying to figure out why I'm getting this error message. I am quite new at this but have followed the video instructions as closely as possible.

Sabastian, can you tell me the easiest way to find out if another profile is loaded? Thanks.