Norton Security Suite "Norton unable to take required system restore point error: -2146959355"

I am running Windows 7 - 64 bit and the Norton Security Suite as supplied by Comcast with all current updates.  When I run registry clean up it get the error message "Norton unable to take required system restore point error: -2146959355".

 

I have uninstalled and reinstalled Norton on several occasions and the error disappears for a few days and then returns.  I am not running any other firewall of filtering programs other than on a manual batch basis.  I am able to reliably create a restore point manually using the Windows System panel.

 

Any ideas what to look for?  Thanks