1) Unzip/unpack the RAR file.
2) Click on BOOT.EXE file.
3) Click on the top left button which actually says INSTALL in Japanese.
4) Now at the top you will see a option box. Choose the first option which says 555MB that fully installs the game in your pc without having to use the actual CD to play.
5) Then choose a folder you want to save it. Click on the bottom right button to proceed.
6) Let the installation process run till it stopped.
7) You will now be back at the menu in Step (3), the top left button is now greyed out.
Do NOT click at the second left button as that uninstall your game.
Now just click on the top right button to PLAY (or click on the icon on your desktop)
and you will be brought to the main Silver Chaos 2 game menu.