I have been looking for this driver for ages… can someone give me a link to download it or something?
Cheers.
Windows XP Driver for Conexant Soft56K Data, Fax, Voice, Speakerphone, PCI Modem
If that does not work, I strongly suggest buying a REAL modem. 
Might I suggest a US Robotics Model 5610-B?
Click here for specifications.
They are about $65.00 or thereabouts.
Being a hard-core geek, and prior to getting DSL, I was a real hardware nazi about modems.
It really does make a big difference.
Good luck and post more if you have additional questions.