As you may already know, Microsoft has announced few months ago the end of some ForeFront products line, including ForeFront Protection the antivirus solution for Exchange, SharePoint and Office Communication Server (yes, Lync never had any updates while it has been long waited since Lync 2010).
As part of this, you may also have read some information about the fact that ForeFront Protection for SharePoint may be installed on top of SharePoint 2013 as no change have been made at the SharePoint antivirus API levels (see the well famous http://www.harbar.net/archive/2013/02/22/Antivirus-and-SharePoint-2013.aspx)
I had a customer which already have ForeFront Protection for SharePoint which wanted to use it for their new SharePoint 2013 implementation. So we tried and… we failed.
Indeed the setup program for ForeFront Protection is looking for some prerequisites which have been (off course) installed, except SharePoint Foundation 2010.
This is now a final conclusion that ForeFront Protection can’t be installed on top of SharePoint 2013.