I have recently bought a usb sound audiocontroller(LEAD 3D Sound 5.1 TIDE) which is a plug and play device. But I have win98 operating system on my PC. Hence it requires a driver to install this device. From where can I download the driver for the same for free??
Please help.

If not mistaken, I believe this is a Plug n Play device which means there would be no drivers for the device, the system should recognize it when put in USB port.

Your 98 may not have 2.0 USB driver support

Here is a link for 2.0 driver for 98, hope this helps
VIA USB 2.0 Host Controller Driver - Free software downloads and reviews - CNET Download.com

Driverguide.com you will need to get a free membership but it is well worth it!