First of all - welcome to BC !
Does this only happen in Chrome or does it happen as well in Firefox or Internet Explorer (IE) as well ?
If it only happens in Chrome, then uninstall Chrome and re-install it. If it happens in other browsers then it is either an internet problem or a sound card problem.
To check if it is a sound card problem, play from a different source - a CD if you have a CD player in this computer or a music file from a USB memory stick, MP3 or WAV it does not matter. If the sound is now good then you will need to check the internet connection. If the sound is still bad it is either a sound card problem or a loud speaker problem. Check the connections and either try different speakers or connect these speakers to a different computer. You will now know if it is the speakers or the sound card.
The simplest way to check the internet connection is with another computer whose sound is known to be good. If you do not have another computer, invite a friend with a laptop to visit and connect the laptop to your internet the same way you do. Wireless if that is what you use, ethernet if you use that.
If the sound on your friend's laptop, or your other computer, is good then the problem is with the internet connection at your old family computer. Check the connections at your computer and, if that does not make an improvement consider replacing the wireless or ethernet card.
If the sound on the second computer is as bad as it is on the family one, then the problem is probably with your router/modem or internet connection. Check with your ISP.