Technology Forum

I have a Compaq Presario V3614AU. Recently I had to replaced its damaged hard drive. I then re-installed windows as well as 8 drivers recommended by Compaq. Since, my notebook hasn't been the same. I am experiencing the following problems: 1. There is no sound output from the notebook. 2. The changes that happen on the screen appear jerky. Eg. when i move an open window around it looks as if it lags and leaves a trail behind it. this problem also occurs when i scroll down a page. It does not scroll smoothly. 3. I used to be able to scroll down a page by simply moving my finger up and down the right side of the notebook touch pad. Now thats not possible any longer. Please advise. Thank you.