Sound problem

I have a sound in my computer then I change my window and now there is no sound can I got my sound back

You should have a small speaker icon in the bottom right of your screen.

Open this and make sure everything is set to high. This sorted out my problem but the issue could have a number of causes.

go to run,and then type in: devmgmt.msc and then device manager should pop up, it should show a list of all your drivers and make sure you don't have any yellow question marks or ! or any red X's...if any of the yellow it's a driver problem...and if it's just an X then it's disabled..then you would have to go under the settings and inable it

right click on my computer and go to properties and then go hardware and then device manager and go to sound video and etc and then right click on the all the audio ones and try to update the drivers