There is a chance it might be the keyboard key mapping thing because whenever I press the 'mute' key, it always happens(it's also tied into the sound since everytime it happens it does the opposite of what it's currently set at to the sound. If the 'mute'(inside the game) button is pressed, it unmutes, and vice versa). And yes, I do have a wireless keyboard.
It'll be the keyboard, then.

If you don't have drivers installed, install them; if you do, uninstall them (NB will result in loss of functionality)

^^ Do what Lusted said

It is, afaik, an issue to do with that, so changing the status quo in that regard ought to work