There's no Windows 7 support for this ancient sound card... it's over 10 years old. Companies don't spend time and resources writing drivers for modern OS's for any device that old. They spend all their time writing drivers for their newer hardware.
It's time for an updated/newer sound card that has support for the OS you intend to use it in.
Note: CT4830 is of the Sound Blaster Live! family from 1998 era.