New Post: Problem to visualize 2D formula

Hello everyone
First of all I apologize for my bad english...
I have a problem to visualize 2d formula of a molecule (Acyclovir): I "write" it in the panel and then press "Ok" but a new window appears saying: "The concise formulae and 2D Depictions are not shown. Also, non-valid labels will not updated. Structure change detected; Please review the labels."

So I write formula's name and press "Ok", but the window remains and nothing happens.
I don't really know what I should do.

I use Word 2013 on Windows 7, if it can be useful to know.

Thanks for help :)
Greetings