Symantec Anti-Virus Installation Error 1714

Hello. I have got myself Symantec Anti-Virus updated version i.e, 8.0. All I want is to install it on my personal computer and make set my system to act as an Anti-Virus Server platform. Though, during installation process it results me an error message saying following strings.
The feature that you are trying to use is on a network resource that is unavailable

Symantic AntiVirus
Error 1714. The older version of Symantec AntiVirus
cannot be removed. Contact your technical support group.
OK
