dude!!!! you can get the update prominently featured in the windows app store on your start screen. click on it> start the download> it will take some time and then you will have to restart the computer...fill in the necessary details and windows 8.1 single language will be set up for you.
in case you don't see the update, in the app store, then you might want to check if windows updates are turned off on your dell machine. turn it on, and install the latest updates. restart the PC and you should see the windows 8.1 update in the app store now....
P.S. you posted in January, so i guess you have already updated the version!!