How do I use the internal system speaker for use of playing regular audio on my PC?

[LOLZpersonok]

I want to know how I can use the internal system speaker that makes only the beep noises in my computer. That computer has Windows Me. It is this other older computer that I have and I want to use sound on it without switching around speakers from my other daily use computer.

I tried multiple Google searches, but I did not succeed in finding any instructions.

The computer is a 1998 IPC computer, with an AMD-K6 processor clocked at 333 MHz.

There is a sound card already installed in it, but I have no intention of removing it.

Additional Information:

Year: 1998
Make: iPC
Model: Select Series
Processor: AMD-K6
Speed: 333 MHz
OS: Windows Millenium Edition
RAM: 64 MB
HDD: 6 GB Maxtor
Condition: Working, great condition

Internal system speaker to play sounds, ex. Windows Media Player plays audio through the internal speaker, Windows sounds play through internal speakers.

Is this possible? If it is how can I do this?

Can I also do this on my 3 year old Certified Data PC?

Info:

Year: 2008
Make: Certified Data
Model: Certified Data
Processor: AMD Athlon X2 Dual Core
Speed: 2.11 GHz
OS: Windows XP Home
RAM: 4 GB
HDD: 250 GB Seagate
Condition: Perfect. No flaws.