Older sound cards, that worked OK in Windows XP can be a problem in Vista/Windows 7/Win 8 as the XP drivers
are not compatible. Some sound functions are handled differently and require Vista/Windows 7 specific drivers. Many older devices are not compatible (hardware and/or internal firmware) and thus a prime reason no compatible drivers are available.
Unfortunately, if you can't find any drivers, you will have to replace the sound card with a Win 7 compatible device. Same way with a new, compatible, USB connected gaming controller. The trials and tribulations of upgrading older hardware to new OS systems that are designed primarily for newer hardware.
If this is a game port joystick you may be able to use a USB/game port adapter but there are no guarantees with these - some devices work satisfactorily and some do not. That would probably less costly than replacing the sidewinder wheel.