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#11
I'm sorry to hear that, are you using a creative sound card? Did you restart after rolling the drivers back? Did you roll back the drivers for "Sound Blaster Audio Controller" or for one of the other Sound Blaster entries? I specifically did the one for the Audio Controller but you could try the others too if you already have tried that one.
Try going into control panel > Hardware and Sound > Sound and making sure the settings there and the default devices seem correct.
Play a file that has audio and see if the green equalizer bars move for any of the items listed while the file is playing even if you can't hear anything. If the green bar is moving set that device to active and see if you get your sound back.