Explaindio is a fairly new software and norton is not yet aware of the codes from the program. So by default, to protect your computer, norton would inform you that this software is a potential risk to your computer.


That is a term called "False positives" where in norton thinks that the file is a virus where in fact it isn't. To work around this issue:

 

1) Disable Auto protect from your Norton Antivirus software.

2) Download and install Explaindio video creator.

3) Resume your Norton antivirus software.


For Reference:

http://www.ghacks.net/2012/06/25/how-to-bypass-symantecs-ws-reputation-1-system/