Vista likes to install games in the Games group on the start menu - a little known fact unfortunately.

Rule one make sure you have admin rights. For example read write and execute.

The Games folder is the central location for all games on your computer. In the Games folder, you can find and open the games installed on your computer, download game information, and keep track of which games.

When you download Chaos online you will type the following Path or Partition information after downloading is done and you are asked for location to extract to. For example Path.

C:\ProgramData\Microsoft\windows\Start menu\Programs\Games

This is the default partition entry information for vista only.

To start a game

Open the Games folder by clicking the Start button , clicking All Programs, clicking Games, and then clicking Games Explorer.

Double-click the game you want to play.

After successful extraction you can drag the exe icon to your desk top. That Path will be C:\Program Files\ChaosOnline\ChaosOnline.exe

Just copy that to your desktop or drag to desktop

Every-time you launch your game windows Vista will update if updates are available. Facts gleamed from Windows Help and How-to and my own thoughts.