You need to install the RTP.
https://s3.amazonaws.com/degica-downloads/RPGVXAce_RTP.zip
The link is also at the bottom of the page, but perhaps I should move it so it's easier to see.
Viewing post in Caliross, The Shapeshifter's Legacy comments
vl gothic is the default font used by RPG Maker VX Ace, so it is included with the RTP. Did something go wrong when you installed the RTP? Like an antivirus warning or anything else? Did you install it in the default folder, or did you pick a different location? Sadly, nobody else seems to have this problem (when the RTP is installed) so I have no idea what could be causing it.
The only other thing I would try is perhaps making sure the RTP is uninstalled then trying re-installing it.