Anyone help me and advise me please?, My PC?

No, you don't need any type of software to correct it. Your speaker might have been blocked by dust or dirt. What you'll need to do is clean your speakers. You could go to best buy, staples, or office depot and get a pressured air computer cleaner. Sorry, I don't know whats it called but it's usually in a can and has a stick on the spray. When you buy it, just put it 2-3 inches away from your speakers and it should help with the sound. If it doesn't work, go to your nearest computer store and they should tell you whats wrong. I don't really think you will really need any cd's or software's to correct it.