Error 1714. The older version of Symantec antivirus cannot be removed

Hello guys,
I got an update of Symantec Antivirus, it is version 8.0. I want to install it on my computer as the anti-virus server. While trying to install it, the Install procedure gives me the following message:
The feature that you are trying to use is on a network resource that is unavailable.
It then says that I can choose a different path, etc. More important is that, when I hit cancel (which, in the end, is all I can do because I have exhausted all other options) I saw this error message:
Error 1714. The older version of Symantec anti-virus cannot be removed. Contact your technical support group.
I want to get rid of this issue. So help needed.
Thanks.
