Creating an unattended installation (also known as a silent installation) is very easy for the K-Lite Codec Pack, K-Lite Mega Codec Pack and Real Alternative.

Simply perform the following command line call:

INSTALLERFILENAME -MakeUnattended

This will start a wizard called "Unattended Install Maker". Follow the instructions given in that wizard. It's very quick and easy.

If you don't know how to perform a command line call, then look below at this page for a tutorial on how to do that.

Working with the Command Prompt

A tutorial for working with the Windows Command Prompt and how to perform command line calls can be found here: tutorial.

Useful tool:

Open Command Window Here: This PowerToy adds an "Open Command Window Here" context menu option on file system folders, giving you a quick way to open a command window (cmd.exe) pointing at the selected folder.

Download (for Windows XP only!)

Or use this registry script to create a Command Prompt context menu item. It should work on all versions of Windows:

REGEDIT4

[HKEY_CLASSES_ROOT\Directory\shell\Command Prompt\command]
@="cmd.exe /k \"cd %1%\""