ASP.NET don't work even though IIS is installed.

ASP.NET don't work even though IIS is installed.
Today I needed to create a Web Application, but couldn't. I got a message that the IIS is not familiar with ASP.NET ver 1.1 .

This can be solved by:
1. Running Start->Run->cmd
2. cd C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322 (or your windows directory)
3. Running: aspnet_regiis.exe -i