Modem driver for HP Vectra VL400 MT…

Here is the problem, I installed WinXP Pro on an HP Vectra VL400 MT, 800MHz, 128MB RAM. I ran into a problem with the modem. I can?t find the driver for it. Its a SMC 56k, model number: smcfm1001. I looked in HP.com and the SMC website, aswell as Driver pages. With no luck, I really need to solve this, my client doesn?t want another modem, I told him he is better off getting another 56k or just getting Cable Internet….oh well