In Device Manager, please check if FxSound Enhancer shows any error. FxSound Enhancer will be under Sound, video and game controllers. Uninstall FxSound with delete driver option checked,
Then try installing FxSound Enhancer from admin Command Prompt,
CD %PROGRAMFILES%\FxSound LLC\FxSound\Drivers
ptdevcon64.exe install
(on 32-bit Windows, run ptdevcon32.exe install)