sound isn't working on my Dell Ultrabook (XPS)?

[Clojo]

It's got Ultrabook on the sticker and XPS on the bottom of the laptop.
Anyway, I've just gone to watch YouTube, and the sound isn't working? There is no sound at all. It's not on mute, it's not my earphones (I've tried without them) and the sound isn't completely down. It's really frustrating...
Does anyone have any idea why it isn't working? It is my school laptop, so I need the sound for my Japanese class.

PLEASE HELP ME!!!!!!

Thanks

[Dell Inc.]

Hi Clojo,

I am Kaveri from the Dell Social Media Outreach team.

You can update the latest sound drivers from Dell support website to resolve this issue. Please find the link below for the same.

Link:- http://dell.to/1hadXqu

1) Enter the Service Tag and press submit button. ( You can find the service tag at the bottom of the laptop on white sticker, it’s a seven digit alphanumeric code which ends with BS or number 1.)
2) Click on Drivers and Downloads.
3) Choose the Operating system.
4) Click on audio drivers and download

In case of any further assistance Please feel free to contact me directly by sending a reply to this blog.
We would recommend you do not post your private information on a public forum.

Thanks & Regards
KaveriD
#iworkfordell
(You can now follow us on you tube for online video support http://dell.to/1aVfW9z)