HTTP Error 500.21-internal Server error solution

Recently reinstalled Windows7, after installing the VS2010 development platform, publishing the Web site to IIS, access to the following error occurred:

HTTP Error 500.21-internal Server error handler "Nickleecallbackhandler" has an error module "Managedpipelinehandler" in its module list

Cause: After you install the framework v4.0, then enable IIS, causing the framework not to be fully installed

Resolve: Start-> All Programs-> attachment-> Right click "Command Prompt"-> Run as Administrator->%windir%\microsoft.net\framework\v4.0.30319\aspnet_ Regiis.exe-i

If not, check the application pool for IIS, use Integrated mode, or if not, change to Integrated mode