Please follow the steps given below .
Open IIS on your system
Go to Application pools and check the ASP.NET V4.0
Run command prompt as Administrator
Run the command C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe –u
It will start uninstalling ASP.NET v4.0.30319
Run the command C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe –ir
It will start installing ASP.NET without changing the existing web applications
Restart your IIS
Please go through the below given screenshot for further reference:
