Well, I could start tossing around ideas from A to Z, or maybe you could give more info. Such as, CPU, GPU, Sound Card, speakers/headphones etc. Did problems start right after Windows 7 or some time later, did you install anything else recently, antivirus checks/updates, antispyware etc.
i would say that maybe your laptop will not hold windows 7 because most computer use a bigger hard drive know so it would make the computer faster antoher is that the graphics card is bad for toribash and sound card for the sound. it depends what windows 7 you installed. becasue there are different types of windows.