NIS 2009 hogs entire PC!

Periodically, say once or twice a week, my NIS 2009 starts using 98 to 100% of the computer time, allowing nothing else to execute. I have determined that the program hogging up the resources is ccSvcHost, but that is all I can tell. When I open the NIS window, it shows CPU usage as "System 100%, Norton 100%" on the bar graphs.

 

When I reboot (which takes aobut ten minutes because no input is being recognized) it works OK until the next time.

 

I use Windows XP, SP3, Media Center Edition.NIS version 16.7.2.11.

 

Anyone else have this problem or have any idea what is transipring?

 

Thanks.