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If the sound card is built onto the motherboard, the drivers for the sound card will be on the cd that came with the motherboard or you should be able to go to the ECS web site and download the drivers.
The USB 1.1 and USB 2.0 is a big issue regarding technology, the 1.1 has maximum speed of 12 megabits where as 2.0 has upto 480 Mbps. And all USB 2.0 devices are compatible with 1.1. Windows XP Home Edition and Windows XP Professional are both fully USB 2.0-compliant with the correct drivers.
So in your case it must work properly. But if the USB 2.0 from microsoft got currepted or badly updated by some thirdparty USB 2.0 driver then it will not work. I have been faced this problem. After doing some stuff I found that if I uninstall the USB drivers and reinstall it from microsoft driver then it works.
So, just go to the Device manager and un-install the USB drivers, then reboot the system to parmanently delete the removed driver. Then install the driver from Windows XP CD.