|The sound drivers and related software for that sound card are not built into Windows 98 because it's sound chipset didn't exist when 98 was first released. |
Is it Windows 98, the original version, or 98SE, the Second Edition?
If you're not sure, RIGHT click on My Computer - that's on the first screen you see - tell us which version it is.
Find the model number that's printed directly on the sound card's surface - it's usually either CTxxxxx or SBxxxxx or Exxxxxx - and tell us what that is.
"The computer also has an internal speaker."
If you mean a single speaker in the case, normally only the mboard uses that, for mboard beeps.
Some SoundBlaster PCI64 cards have a built in amplifier, but some of them don't.
You may need to use amplified speakers meant for use with a computer with the sound card. If it's a single pair of speakers, the 1/8" port on the card the speakers must plug into is usually green. Un-amplified speakers may produce no sound at all, unless the card has a built in amp.