How to add ASP.NET 4.0 as Application Pool on IIS 7, Windows 7

1. Open your command prompt (Windows + R) and type cmd and press ENTER
   You may need to start this as an administrator if you have UAC enabled.
   To do so, locate the exe (usually you can start typing with Start Menu open), right click and select "Run as Administrator"
2. Type cd C:\Windows\Microsoft.NET\Framework\v4.0.30319\ and press ENTER.
3. Type aspnet_regiis.exe -ir and press ENTER again.