It sounds like the game cannot detect your sound device.
1) Disable your audio device in sound -> playback. The reenable it after restarting your computer (right click -> show disabled devices to see it) 2) Do you have an audio driver installed? If yes, try uninstalling and reinstalling it. If you just reinstalled your OS, you may need to find an audio driver for your hardware. You can look up hardware ids online (you get this from device info in device manager) to figure out the manufacturer and model and then try your luck in finding a driver for it. If the manufacturer does not have a driver available you can also search Computer OEMs for other laptops with the same hardware and if they offer a windows 7 driver install that. Also some drivers for win8/10 will work on win 7 if the driver lets you install (I had this problem trying to find a win7 wifi driver for my laptop) 2b) If this is a new OS install you also want to look for chipset drivers as it affects audio 2c) Windows might have a built in non-generic driver for your audio device that works if you cannot find a win7 driver. You need to go device manager -> update drivers and fiddle around with the wizard until it lets you select a make/model of the device (it's not select a driver from disk or look online but it's hidden under the let windows detect flow iirc). It's pretty hidden in the wizard I don't recall off the top of my head, on linux right now so I can't walk you through it. 3) Do you have a microphone port? Is it broken (eg always on/off)? I had this before, had to do some fun hackery to turn back on audio. Google is your best bet here.