Netguard Installer has insufficient privileges to modify the file

Greetings to all, I am posting here an experience while I am installing sophos to my computer, while I was installing, right in the middle of the process, an error message appeared on my screen, it is telling me that I don't have rights to write to a file, see below the screen shot of the error for better understanding of my problem.
Error 1321. The Installer has insufficient privileges to modify the file
E:Program Datantlntl Netguardexclusion.xml.
After I read on the error above, I checked on my privileges, its seems I got all privileges because I am using an administrator account, by this I am run out of idea in solving this issue, please share some ideas on my post, thanks a lot.
