Sometimes updates for hardware come via Microsoft updates. If you were to roll back the update for the sound card then check if there are any updates for the sound card via the Microsoft updates and hide that update. 1, Click start 2, Right click "Computer" 3, Click "Properties" 4, Look top left for "Device Manager" click that. 5, Look in device manager for "Sound, Video and Game Controllers" 6, Right click the Driver for that sound card & click Properties. 7, Click Tab "Driver" 8, Then look for "Roll Back Driver" and click ok.
To do system restores does not only affect the sound card, but will affect other hardware updates & Microsoft updates also.