- You try to install the .NET Framework 4.5 on a computer that has the .NET Framework 4 installed.
- You cancel the installation. Or, the installation fails.
Method 1Use the ASP.NET IIS Registration tool (aspnet_regiis) to reregister ASP.NET 4 by running the following command:
Method 2Repair the .NET Framework 4 Extended Profile. To do this, click the Repair button in the .NET Framework 4.5 installation program.
Note If you have custom application pools that target ASP.NET 4, use IIS Manager (inetmgr.exe) to manually reset them to target ASP.NET 4.
Article ID: 2738076 - Last Review: 30 Aug 2012 - Revision: 1