Symantec Anti-virus and it is 8.0 versions

Hello all,
I use an update for Symantec Anti-virus, and it is 8.0 versions.
I am attempting to set up it on my PC with the intention of using my PC as the anti-virus server.
But when I attempt to set up it, the set up Shield and I find the following error message:
“The feature that you are trying to use is on a network resource that is unavailable”
It tells me that I am able to go into a dissimilar path, etc. Moreover, when I select cancel I find this error:

Symantec AntiVirus
Error 1714. The older version of Symantec AntiVirus
cannot be removed. Contact your technical support
group.
OK
I need to solve this. Please help me to solve it.
Thanks in advance.
