Hello, I have an acer laptop, not sure the exact make and model. I can get it if it is needed but it is two or three years old. The sound has recently become slow and distorted, the internet speed is fine besides that. The video plays normally, but the sound just drags and is extremely distored. The virus protection went out of date recently but I think the sound was like that before. Should I get more anti virus, more Ram, or what should I do?