In order to be able to listen to your music, a sound card converts digital data to analog sound waves you can hear. The output signal is then connected to a headphone or set of speakers. You can also use a sound card to record audio with a microphone
I receive interpersonal support on almost every sight I go on: even on this one right now! An example of interpersonal support can be a typing editor, I believe.
Choose Start→All Programs→Windows Virtual PC and then select Virtual Machines. Double click the new machine. Your new virtual machine will open onto your desktop. Once it's open, you can install any operating system you want.