Internet stopped working after installing Xfce on Arch

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http://unix.stackexchange.com – Let me preface this by saying I'm not experienced in any of this. I followed the in-depth beginners guide for installing Arch using VirtualBox. I was able to install Arch just fine. After everything was installed I was able to ping different websites so it looked like the internet was working, not to mention I was able to download packages just fine from the internet with pacman. I then went to install Xfce because I heard it is a nice desktop environment. I think I also installed some stuff to do with VirtualBox Guest Additions (not really sure what they are). I was able to install tha (HowTos)