You can also visit this link for additional drivers. This WILL solve your driver problems for the Compaq Presario 336-DF 56k upgradeable driver. Haven't got upgrade to work, however, this will get modem working back at 33.6. Enjoy.
The following files are found inside the driver download file.
|336df56k.exe||78.6 KB||4 Feb 1999|
|Ccsda1._01||1.3 MB||4 Feb 1999|