Windows Vista 2 problems: touch pad does not work, media players does not play sound

I have a laptop HP, processor Intel core due 2, operating system windows vista

First problem
the sound, whenever I open a media player (e.g. quick play), or watch a video in YouTube, or even when I play games, there is no sound, I did a temporary solution, sometimes by chance when there is sound played in a YouTube video, I can play the other videos/games.

Second problem
In my laptop there is a touch pad I can use it to move the cursor, but I cannot use the touch pad to click on objects (I use the left mouse and the right mouse button below the touch pad)

This problem appeared when I connected a mouse (USB) to the laptop, even when I remove the mouse the touch pad doesn't work.


if you need any clarifications let me know

thank you in advance