Installing postgis extension blocked by Antivirus

[Nigel White]

A novice enquiry.

I have just successfully installed pgadmin and postgressql to my WIndows 
10 PC.  However, I wish to instal the postgis extension. When I try to 
do so it is blocked by the Norton Antivirus on my my PC, claiming it 
contains a Trojan.  I assume that this is a false positive and have 
forwarded the .exe file to Norton to be checked.

Have there been any other similar reports and how should I get round this.

Thanks