We can assure you that our website and demo are 100% safe.
We do put strong encryption on our documents in order to prevent people from obtaining our documents for free. Some firewalls/antivirus confuse this strong encryption as a risk/threat. Professionals call this a false-positive.
The most common antivirus do not interfere with Business-in-a-Box, as you can see in Virus Total web site (direct link to set up file analysis below)
Business-in-a-Box analysis on Virus Total
We recommend that you add BiB to your trusted programs within your security software (mostly named exception list) and then download Business-in-a-Box from www.biztree.com/download.
Also, please let us know the name of your antivirus so that we can report the false positive error.