Those wont affect your audio, unless their some sort of startup app that disables your audio drivers. Or the install rendered something useless on your PC. In your task bar on the bottom right, is there a driver icon of any sort?
Go to "My computer" on your desktop (right click that) ,
click properties, this will bring up your system manager.
On the left, click "Device Manager", on the left you have certain devices,
go to "Sound, video, game controllers" and click that so it gives you some options that appear under it.
Once you see those new options, it should show something along the lines of "VIA" or "Realtek". If you see either of those double click the one(s) that show up and go to the driver tab near the top.
Click on "update driver", if it states it's already updated, then proceed to click "roll back driver".
If the above doesn't work then it could be a speaker issue to an actual windows issue if you did install something just recently. If it doesn't work, try using a headphone/earphone 3.5mm connection and see if that works.
By the way I'm on windows 7, but it should transcend to earlier models.