Excessive problems causing High CPU Usage Why so many with NIS?

I am trying to ascertain how to fix ccSvcHst.exe problems with NS 2009 and is Norton sorting it for 2010 version.

I have unisnstalled NIS2009 and  CPU Usage is normal

With NIS 2009 installed and Definition updates complete CPU usage shoots to 100% with ccSvcHst.exe causing the problem

computer then is inoperative

If I Turn on Silent Mode, then reboot everthing works fine (Its is like the security program is not installed  so fast) until the expiry of the 6 hr limit.

Turning on Silent mode without rebooting still slows down the computer .

Any ideas would be welcomed please.

I prefer NIS to other security software, but it is getting to the stage when I can not tollerate the slowness anymore.

(Apologies if this is  double posted with new thread but believed I originally posted in a closed thread)