It's a Presario 1426NX.
From what I've read, the drivers are only available on the system recovery disc. However, either I don't have the disc or I never got one. I'm thinking I never got one, because they had a recovery drive partitioned on the hard drive which was supposed to be used in place of the CD. Well, my hard drive was physically damaged so I couldn't access the partitioned drive. So I had to get a new hard drive and start from scratch. I've been to the Compaq web site but they don't show any sound drivers available for download.