I have a compaq Presario. I have a compaq Presario that came with windows 98SE.Recently I Upgraded

Question

I have a compaq Presario that came with windows 98SE.Recently I Upgraded it to Windows XP Pro SP2.Since then My ESS Integrated Audio Card can't load.I keep getting the message ESS PCI audio controller can't be found. I then downgraded it back to Windows 98 SE thinking that would solve the problem but it did not.So this is my dilema right now.My computer can't locate the card.Any Idea what might have had caused that problem?