CentOS 5
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Create Virtula Machine
  Create Virtula Machine. This example show to install Debian Lenny. Desktop Environment is needed.

[1] Open 'System tools' - 'Sun VirtualBox', then following screen is shown. Agree license agreement first.
[2] Input your registration information.
[3] Click 'New' button.
[4] Go next.
[5] Specify the name and OS type for Virtula Machine.
[6] Specify amount of memories.
[7] Specify virtula disk. It's new on here, so Go next by default.
[8] Select disk type.
[9] specify the name and mount of disk.
[10] Click 'Finish'.
[11] Click 'Finish'.
[12] Click 'CD/DVD-ROM' because install from it on here.
[13] Check a box 'Mount CD/DVD Drive' and OK.
[14] Back to the screen [12] and click 'Network', then select 'Bridged Adapter'.
[15] Click 'Start' button.
[16] Virtual Machine starts and Installer runs.
[17] Installation finished and Debian Lenny is running.