The solution to the error report of installing windowsServer Server website

When everything is done on the site where the windowsServer server is installed, the handler "PageHandlerFactory-Integrated" has an error module "ManagedPipelineHandler" in its module list. The system uses .net 4.0, obviously used the installation version to install, the installation process does not have any error prompt, why?

Find the installation path of .net 4.0, I am windowsServer2008R2 64Bit Aliyun's machine, the directory is under C:\ Windows\ Microsoft.NET\ Framework64\ v4.0.30319\, if it is a 32-bit machine, it should be under C:\ Windows\ Microsoft.NET\ Framework\ v4.0.30319\; start cmd (hold down "win + R", type "cmd", and then enter); execute program: aspnet_regiis.exe-I; register the 4.0 framework through aspnet_regiis. If all goes well, the following will appear:

OK, the website opens normally, everything is going well!