Looking for Qualcomm USB Modem drivers for Windows Vista

I am looking for driver of Qualcomm USB Modem. I am using a Windows Vista system. Can anyone help me to provide the same. It is a regular system and I had tried to find that through searching on Google. I found some websites but the drivers provided for them is not working. Can anyone provide me the drivers. I am a bit doubtful about using the same on Vista, because the same is working well on Windows XP.

What about the official website of Qualcomm. Did you checked on that. If you cannot locate any drivers on other website, then you can try the official website for compatible drivers. For Vista I a bit doubtful that you can find the driver if it is a very old modem. For new stuff you can try the chipset driver of your laptop. You can find that on the official manufacturer's website.